What is hydrology?

А. the study of weather patterns throughout the earth

B. the study of oceans and freshwater sources

С. the study of the movement and distribution of water on earth
the study of the movement of air throughout the earth

What Is Hydrology?. The Study Of Weather Patterns Throughout The EarthB. The Study Of Oceans And Freshwater

Answers

Answer 1

Answer:

c

Explanation:

Hydrology is the study of the distribution and movement of water both on and below the Earth’s surface, as well as the impact of human activity on water availability and conditions.

Answer 2
Answer : B
I did it on edgy and

Related Questions

1.What is the maximum amount of the substance that will dissolve in 100 3
cm of water at 30°C?
A. 25 g
B. 33 g
C. 57 g
D. 125 g
2. The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.
Which point represents a supersaturated solution of the unknown salt? A. Q
B. R
C. S
D. T
3. The illustration below lists the pH of various substances.
Which of the following substances is the closest to a neutral pH?
A. milk
B. vinegar
C. ammonia
D. milk of magnesia
4. The figure below shows where solution X and solution Y fall on the pH scale.
Which statement correctly compares solutions X and Y?
-
A. Solution X has a higher concentration of hydroxide ions (OH ) than
solution Y.
3+
B. Solution X has a higher concentration of hydronium ions (H O ) than solution Y.
3+
C. Solution X and Y have equal numbers of hydronium (H O ) and
-
hydroxide (OH ) ions.
3+
D. Solution Y has a higher concentration of hydronium ions (H O ) than solution X.

5. The graph below shows the amount of salt that dissolves in 100
milliliters (mL) of water at various temperatures.

Based on the graph, what is the likely amount of salt that will dissolve in 200 mL of water at 90°C?
A. 35 grams
B. 40 grams
C. 80 grams
D. 100 grams

6. The graphic shows sugar in a cup before and after it has dissolved.
Which action most likely occurred in order for the sugar to dissolve?
A. The water was stirred.
B. The sugar was cooled.
C. The sugar settled to the bottom.
D. The water evaporated from the top.
7. Look closely at the illustration below showing where the compound
sodium hydroxide falls on the pH scale.

What type of compound is sodium hydroxide?
A. acid
B. base
C. element
D. salt

8.The graph shows the solubility of carbon dioxide (CO ) in water at
different temperatures.
Explain how temperature affects the solubility of carbon dioxide in water.
9.The graph shows solubility curves for four salts across different
Temperatures.
How many grams of NaCl will dissolve in 100 grams of water at 100°C?
A. 10 g
B. 33 g
C. 40 g
D. 42 g

10. The graphic shows an investigation being performed by four students.
Each student will pour 10 grams of sugar into 100 milliliters of water into
his or her container. They will stir the water gently for 20 seconds. Which
student's sugar will most likely dissolve the fastest?
A. Jennie
B. Al
C. Adriane
D. Marcus

11.Which of the following is NOT a way to increase the solubility of a solid
in water?
A. crushing the solid
B. shaking the mixture of solid and water
C. raising the temperature of the water
D. letting the mixture stand still a long time

12.The dissolved substance in a solution is the
A. solute.
B. solvent.
C. tincture.
D. suspension.

13.Which of the following refers to the concentration of a substance?
A. the size of the particles that make up a substance
B. the grams of solute dissolved per 100 g of solvent
C. the minimum volume of solvent dissolved per liter of solution at a
given pressure
D. the maximum amount of a solute that can be dissolved in a solvent
at a given temperature

14.A soil sample with a pH of 4.5 is
A. neutral.
B. acidic.
C. basic.
D. inconclusive.

15.Which of the following combinations would create the fastest chemical
reactions?
A. a whole antacid tablet and vinegar at 25 degrees Celsius
B. a whole antacid tablet and vinegar at 50 degrees Celsius
C. a crushed antacid tablet and vinegar at 25 degrees Celsius
D. a crushed antacid tablet and vinegar at 50 degrees Celsius

16.What substances change color when added to acids or bases?
A. indicators
B. electrolytes
C. insulators
D. capacitors

17.The table below shows four solutions that were prepared by dissolving
salt in water.
Which of the solutions has the highest salt concentration?
A. Solution A
B. Solution B
C. Solution C
D. Solution D

Answers

Answer:

FOr question 5, the answer is 80 gramas.

Explanation: According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

(Will come back later for edits)

According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

What does the graph shows?

The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.The ratio of a constituent's abundance to the total volume of a mixture is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

Salt in freshwater is less than that in salt water, and the concentration of salt in the Dead Sea is greater than the concentration of salt in the oceans. The Dead Sea has a salinity of 33.7 percent, and the second-saltiest lake in the world is the Dead Sea.

Therefore, According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

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Litmus turns
in acidic solutions.
green
yellow
blue
red

Answers

Answer:

red

Explanation:

red shows if solution is acidic

Select the correct answer. Which of the below is an example of mimicry that enables prey species avoid predation

Answers

What are the answers? I assume you meant to attach a photo.

Answer:

Thus, the one that is an example of mimicry that enables prey species to avoid predation is a harmless organism imitating the look of a harmful one (option B).

Explanation:

Consider the titration of 82.0 mL of 0.140 M Ba(OH)2 by 0.560 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. (a) 0.0 mL WebAssign will check your answer for the correct number of significant figures. 13.447 Correct: Your answer is correct. (b) 15.0 mL WebAssign will check your answer for the correct number of significant figures. 12.25 Incorrect: Your answer is incorrect.

Answers

Answer:

a) pH = 13.447

b) pH = 13.176

Explanation:

Ba (OH)₂ is a strong base and ionizes completely in solution to give barium amend hydroxide ions.

The equation of the dissociation of Ba(OH)₂ is given below:

Ba(OH)₂ ----> Ba2+ + 2OH-

1 mole of Ba(OH)₂ produces 2 Moles of OH- ions

a) Before the addition of HCl, i.e.,when 0.00 mL of HCl has been added;

Concentration of hydroxide ions, [OH-] = 0.140 x 2 = 0.a) [OH-] = 0.100 x 2 = 0.280

pOH = -log [OH-]

pOH = -log (0.280)

pOH = 0.553

pH = 14 - 0.553= 13.447

b) pH when 15.0 mL HCl has been added

Moles Ba(OH)₂ = concentration × volume

Volume of Ba(OH)₂ = 82.0 mL = 0.082 L, concentration = 0.140 M

moles of Ba(OH)₂ = 0.082 x 0.140 = 0.01148 moles

moles OH- produced by 0.01148 moles of Ba(OH)₂ = 2 x 0.01148= 0.02296

moles HCl = 0.0150 L x 0.560 = 0.0084

moles of H+ produced by 0.0084 HCl = 0.0084

0.0084 H+ willnreact with 0.0084 moles of OH-

moles OH- left after the reaction = 0.02296 - 0.0084 = 0.01456 moles

total volume of new solution = (82 +15) mL = 97 mL => 0.097 L

Concentration of OH- ions = moles / volume

[OH-] = 0.01456 / 0.097 = 0.1501

pOH = -log [OH-]

pOH = -log (0.150)

pOH = 0.824

pH = 14 - 0.824

pH = 13.176

what is the relationship between heat and temperature?

Answers

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Answer: according to ck12.org "Heat is the sum of all the kinetic energies of all the molecules of an object, while temperature is the average kinetic energy of the molecules of an object."

Explanation:

I hope this helped!

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- Zack Slocum

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the transfer of thermal energy that causes a metal spoon in hot liquid to get hot.

Answers

Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

If a compound contains a poly atomic ion then what type of compound is it A. Convalent Compound B. Ionic Compound

Answers

Answer:

B. Ionic Compound

Explanation:

An ionic compound is that compound which contains a positively charged ion called CATION and a negatively charged ion called ANION. The cation loses or transfers electrons to the anion, hence, making the former (cation) positive and the latter (anion) negative.

A polyatomic ion is an ion that contains more than one type of atom e.g OH-, NO3²-, CO3²- etc. A polyatomic ion usually has an overall charge formed from the charges of the individual atoms that makes it up. For example, in OH-, the overall charge is -1.

Since a polyatomic ion can have an overall positive or negative charge, it must enter a reaction with another ion that complements it i.e. a negative polyatomic ion will react with a positive ion to neutralize its charge. Hence, this forms an IONIC COMPOUND. This is why most compounds with polyatomic ions are IONIC COMPOUNDS.

For example, CaCO3 is an ionic compound formed when Ca²+ (cation) reacts with the polyatomic anion: CO3²-

Evaluate three communication skills that can assist you in sustaining positive relationships​

Answers

1. Accept and celebrate differences. One of the biggest challenges we experience in relationships is that we are all different. We can perceive the world in many ways. Certainly astumbling block that we come across when we try to build relationships is a desire or an expectation that people will think like we do and, in this way, it is so much easier to create a rapport. We feel more comfortable when we feel that people “get” us and can see our point of view. Life, however, would be very dull if we were all the same and, while we may find it initially easier, the novelty of sameness soon would wear off. So accepting and celebrating that we are all different is a great starting point.

2. Listen effectively. Listening is a crucial skill in boosting another person’s self-esteem, the silent form of flattery that makes people feel supported and valued. Listening and understanding what others communicate to us is the most important part of successful interaction and vice versa.

Active or reflective listening is the single most useful and important listening skill. In active listening, we also are genuinely interested in understanding what the other person is thinking, feeling, wanting, or what the message means, and we are active in checking out our understanding before we respond with our own new message. We restate or paraphrase our understanding of their message and reflect it back to the sender for verification. This verification or feedback process is what distinguishes active listening and makes it effective.

3. Give people your time. Giving time to people is also a huge gift. In a world where time is of the essence and we are trying to fit in more than one lifetime, we don’t always have the time to give to our loved ones, friends, and work colleagues. Technology has somewhat eroded our ability to build real rapport and we attempt to multi-task by texting and talking at the same time.

Being present in the time you give to people is also important, so that, when you are with someone, you are truly with someone and not dwelling in the past or worrying about the future. The connection we make with other people is the verytouchstone of our existence, and devoting time, energy, and effort to developing and building relationships is one of the most valuable life skills.

What is a flame test?
A. A method for determining the products of combustion
B. A method of obtaining an emission spectrum from a sample
C. A method for testing the flammability of a sample
D. A method for determining the temperature of combustion
SUBMIT

Answers

Answer:

B. A method of obtaining an emission spectrum from a sample

Explanation:

Flame test is a method of obtaining an emission spectrum from a sample.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.Flame test is characteristic for each element as that of an emission spectrum.

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a repelling force occurs between two charged objects when the charges are​

Answers

Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

Which of the following statements best defines the theoretical yield of a reaction?

a) The ratio of measured yield over actual yield

b) The amount of product measured after a reaction

c) The ratio of measured yield over stoichiometric yield

d)The maximum amount of product that can be obtained

Answers

The statement which best defines the theoretical yield of a reaction is the maximum amount of product that can be obtained.

What is yield of any reaction?

Yield of any chemical reaction gives idea about the amount of product that will be produced by the chemical reaction between reactants.

Theoretical yield gives idea about the how much maximum yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.

Hence theoretical yield is the maximum amount of product that can be obtained.

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Which statement describes particles of an ideal gas, based on the kinetic molecular theory?

Answers

Answer:

There are 5 steps/rules of the ideal gases based on kinetic theory.

Explanation:

1. Particles in a gas are constant moving in random motion.

2. combined volume of the particles is negligible.

3. particles exert no forces on one another

4. any collisions between the particles are completely elastic

5. the average kinetic energy of particles is proportional to temperature in kelvins.

(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)

4. What was the original volume of a gas that expanded to 25
temperature change from 1 to 10 degrees Celsius?

Answers

Report that guy who put the first answer he’s trying to get your ip

Can someone help me with this. Thank you

Answers

Answer:

Location x is experiencing daytime because it is facing directly to the sun.

Explanation:

From a background understanding of the solar system, the side of the planet facing the sun will be experiencing daytime while the other side of the planet will be experiencing either partial or total darkness depending on the location.

From the diagram given above, we can see clearly that location x is facing the sun and as such, light rays from the sun lightens the location. When this happens, location x will be experiencing daytime.

In conclusion, location x is experiencing daytime because it is facing directly to the sun.

As you move from left to right within a period (row), what is the pattern?

Answers

From left the right

How many milliliters of 3.0 M H2SO4 are needed to make 450 mL of 0.10 M H2SO4?

Answers

97.2223 ) check the comments

Explain why only one type of seismic wave was recorded at location B. (1 sentence only!)

Answers

Answer:

p wave

Explanation:

The P wave is designated the primary preliminary wave because it is the first to arrive at a seismic station after an earthquake. It travels at a speed usually less than 6 kilometers per second in the Earth's crust and jumps to 13 kilometers per second through the core.

A sample of gas occupies 2.30 L at 825 mmHg and 70.0°C. What is its volume at STP

Answers

Answer:

V₂ = 2.0 Liters at STP conditions

Explanation:

Solving problem using the combined gas law

Given:

Case I Conditions           Cast II Conditions

P₁ = 825mmHg                P₂ = 760mm

V₁ = 2.30 Liters                V₂ =  ?  

T₁ = 70°C + 273 = 343K    T₂ = 0°C = 273K                  

Substitute into combined gas law assuming moles of gas remains constant; solve for unknown volume under case 2 conditions

P₁·V₁/n₁·T₁ = P₂·V₂/n₂T₂ => V₂ = P₁·V₁·T₂ / P₂·T₁  => note: in this solution, moles of gas remains constant as is disregarded in final calculation.

V₂ = (825mm)(2.3L)(273K) / (760mm)(343K) = 1.987 Liters (calculator answer) ≅ 1.9 Liters (2 sig figs based on given volume (V₁)

V₂ = 1.987 Liters ≅ 2.0 Liters (2 sig figs based on given volume (V₁)                    

how can a match light without a spark

Answers

Answer:

Use friction

Explanation:

Friction is the force that stops something in motion. It also heats up something, creating a gravitational heat! A match striked against the lighter will create a flame, because of friction :)

Using friction would. Newton’s law applies here and many other situations

_______ in saliva start the chemical digestion process​

Answers

Answer:

amylase

Explanation:

The H-R diagram is useful in
studying all of these about a star
A.except for its brightness b.location in the sky c.temperature
D.magnitude

Answers

Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

can someone at least help with one of these i will give brainliest

Answers

Answer:

1375 J/kg.°C

Explanation:

From the question First question,

Q = cm(Δt)................... Equation 1

Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.

make c the subject of the equation

c = Q/mΔt.................. Equation 2

Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C

Substitite these values into equation 2

c = -5500/[0.2×(-20)]

c = -5500/-4

c = 1375 J/kg.°C

Consider the reaction.

HCl(aq) + KOH(aq) ⟶ KCl(aq) + H2O(l)
In the reaction shown, HCl is

Answers

Answer:

the acid used to neutralize the base in oder to form a salt and water

A sealed balloon occupies a volume of 250 mL at an unknown temperature. When the temperature is altered to 30 C, the balloon's volume becomes 0.5 L. Calculate the initial temperature of the air in the balloon.

Answers

Answer:

Initial temperature, T1 = 15°C

Explanation:

Given the following data;

Initial volume, V1 = 250 mL to Liters = 250/1000 = 0.25 L

Final temperature, T2 = 30°C

Final volume, V2 = 0.5 L

To find the initial temperature T1, we would use Charles' law.

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles is given by;

[tex] \frac {V}{T} = K[/tex]

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Making T1 the subject of formula, we have;

[tex] T_{1}= \frac{V_{1}}{V_{2}} * T_{2}[/tex]

Substituting into the formula, we have;

[tex] T_{1}= \frac{0.25}{0.5} * 30[/tex]

[tex] T_{1}= 0.5 * 30 [/tex]

Initial temperature, T1 = 15°C

If it takes 25 mL of 0.05 M HCl to neutralize 345 mL of NaOH solution, what is the concentration, M, of the NaOH solution?

Answers

Answer:

400ml

Explanation:

A woman weighing 600 N is leaning on the ground with shoe soles with a total area of ​​0.04 m2. Calculate the pressure of the motors

Answers

Answer:

1.5×10^4

Explanation:

Pressure= force/area

P= 600/0.04

P= 15000

P= 1.5×10^4

Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of cornstarch that dissolved.
all
about half
none
20
25 ml
15
10
5
Intro

Answers

Answer:

The correct answer on edge for 2021 is C. None.

Explanation:

We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.

The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.

What is the solution?

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.

Thus, option C is correct.

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litmus is made from plant pigment.

it is red when placed in an acidic solution.

it is blue when placed in an alkaline solution.

it is purple when neutral.


a) what do we call substance that change colour like this?
b) what colour would litmus be in a solution of pH 10?
c) what colour would you expect litmus to be in pure water?

Answers

Answer:

For (a): The substances are known as acids and bases.

For (b): The color of the litmus for pH = 10 will be blue.

For (c): The color of the litmus for pure water will be purple.  

Explanation:

pH determines the acidity or basicity of a solution. There are three types of solution classified based on the pH:

If pH<7 then the solution is acidic in nature If pH>7 then the solution is basic/alkaline in nature If pH=7 then the solution is neutral in nature

Litmus paper is used as an indicator to know the type of solution. There are 2 types of litmus paper:

Red litmus paper: It turns blue when placed in a basic/alkaline solution.Blue litmus paper: It turns red when placed in an acidic solution.

(a):

An acid is defined as the chemical species that produces hydrogen ions in the solution while a base is defined as the chemical species that produces hydroxide ions in the solution.

(b):

Given pH value = 10

The solution is basic in nature, thus the color of litmus will be blue.

(c):

Pure water is neutral in nature and has a pH of 7.

Thus, the solution of litmus would be purple.

a force is 24N is exerted on 2 carts. Cart A has a mass of 45kg and cart B has a mass of 25kg. Which cart will have the greater acceleration? ​

Answers

Cart b will be longer

A family is driving to a nearby city. If they traveled 224.4 miles for 3.3 hours how fast were they traveling?

Answers

Answer:
224.4/3.3=68mph
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Fiona is a manager who believes in Theory Y of leadership. What does she assume about her employees according to this theory?OA. Employees have to be reprimanded for bad ideas.O B. Employees are self-motivated in their work.O C. Employees need constant supervision.OD. Employees are always ready to leave the company. What the perimeter of the triangle Consider the series 1/4 1/8 1/16 1/32 What is an expression of Sn for the series shown? How can family members effectively solve problems together? by hiding uncomfortable emotionsby seeking outside help when necessaryby agreeing only with easy solutions by thinking about something else when communicating I need help solving this problem. La pelota tienen forma ________.1. redondos2. redonda3. redondas The use of an organization's operational data as the source data for a business intelligence system is not usually recommended because it ________. A. considers only the external data and not the internal data regarding the organization's functions B. is not possible to perform business intelligence analyses on operational data C. requires considerable processing and can drastically reduce system performance D. is not possible to create reports based on operational data Use the paragraphs to complete the activity. Patrick lived in Emoryville, but every Saturday morning he rode two city buses to his uncles bookstore in Northview where he worked. He didnt mind the commute because he loved his job. He loved spending time with his uncle, but he also loved going to work because he had become friends with Andrew, one of his co-workers. The boys would talk about everything from baseball scores to movies to favorite pizza toppings.So this Saturday, when Patrick got to work, he and Andrew got to talking as they always did.Hey, Pat, Andrew said casually.Hey, said Patrick. Did you have a good week?Yeah, he said. Great week. My basketball team made it into the semifinals. The game is tonight. Were playing Emoryville, our nemesis.Before Patrick could say another word, Andrew continued. I dont like Emoryville. I dont think I could ever be friends with someone from that town. Our schools are such rivals.Patrick was speechless.Where are you from, Pat? I cant believe Ive never asked you that before!Patrick fumbled over his words. Not too far from here, he said before he quickly changed the subject to the new shipment of graphic novels.Suppose Patrick's uncle enters the scene. In 35 sentences, explain how the additional point of view might add humor or suspense to the scene. Groundcover, Inc. had never had a treasury stock transaction prior to 2016. It experienced the following treasury stock transactions during 2016: 4/1/2016:Reacquired 1,000 shares of its own $5 par common stock, originally sold at $12 a share, for $10 a share. 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PLLSSSSS HELPPPP I DONT GET THIS AT ALL the height of the rectangular box is 4 times its width, and its length is 2 in more than its width. the volume of the box is 60in^3 Using the free cash flow valuation model to price an IPO - Assume that you have an opportunity to buy the stock of CoolTech, Inc., an IPO being offered for $12.50 per share. Although you are very much interested in owning the company, you are concerned about whether it is fairly priced. To determine the value of the shares, you have decided to apply the free cash flow valuation model to the firm's financial data that you've developed from a variety of data sources. The key values you have compiled are summarized in the following table.Free cash flowYear (t) FCFt Other data2016 $ 700,000 Growth rate of FCF, beyond 2019 to infinity 5 2%2017 800,000 Weighted average cost of capital 5 8%2018 950,000 Market value of all debt 5 $2,700,0002019 1,100,000 Market value of preferred stock 5 $1,000,000Number of shares of common stock outstanding 5 1,100,000a. Use the free cash flow valuation model to estimate CoolTech's common stock value per share.b. Judging on the basis of your finding in part a and the stock's offering price, should you buy the stock?c. On further analysis, you find that the growth rate in FCF beyond 2019 will be 3% rather than 2%. What effect would this finding have on your responses in parts a and b? A fiscal year is best described as a __________ year. A. calendar B. business C. school D. shortened What do all the band members not believe about Bud? This image shows the rock cycle.Which event most likely occurs at point V?coolingerosionheatingmelting Suppose that a large mixing tank initially holds 300 liters of water in which 50 kg of salt have been dissolved. Another brine solution, with a concentration of 250 g/L, is pumped into the tank at a rate of 5 L/min, and the tank is also being emptied at a rate of 5 L/min. The fluid in the tank is being constantly stirred, and we can assume that, at any moment, the concentration is uniform throughout the tank. If A(t) represents the amount of salt (in kg) in the tank at time t, find a first-order differential equation for A(t), and write down the initial condition that goes with this equation.