A research study variable that is believed to be related to the study's variable of interest is accurately described by each of the following terms except dependent.
What is a research variable?
Any variable employed in research that has a cause and effect relationship is referred to as a research variable (also known as a study variable) informally. An array of variables, including independent factors, dependent variables, and intervening variables, can be employed in a study, including research/study variables.
Independent and dependent variables are crucial in research since they provide the framework for a study to be carried out. Confounding factors, controlled variables, superfluous variables, and moderator variables are some other sorts of variables that could be used in a research.
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A rectangular pool is 20 feet by 30 feet. The depth of the pool is 60 inches, but the depth of the water is 3/4 of the depth of the pool. Find each measure to the nearest tenth. (Lesson 1-7)
b. the volume of water in the pool
The water in the rectangular pool which has a depth of 3/4 of the pool's depth has a volume of 2250 cubic feet.
If the depth of the water is 3/4 of the depth of the pool and the depth of the pool is 60 inches, then
depth of the water = 3/4 of the depth of the pool
depth of the water = 3/4(60 inches)
depth of the water = 45 inches = 3.75 feet
Volume is defined as the amount of space any object occupies. The volume for a rectangular prism is given by the formula:
V = lwh
where v is the volume
l is the length
w is the width
h is the height
Since the water occupies the inside of the rectangular pool, to solve the volume of the water, use the formula for the volume of a rectangular prism.
V = lwh
V = 20 feet(30 feet)(3.75 feet)
V = 2250 cubic feet
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If y=-1 is a zero of the polynomial q (y) = 4y³+ ky² - y -1, then find the vaLue of k
Answer:
Step-by-step explanation:
Since zero of a polynomial function is a value of the variable at which the function's value is 0, 0=4(-1)^3+k(-1)^2-(-1)-1, for the given polynomial q(y)=4y^3+ky^2-y-1
simplifying the above gives: 0= -4+k+0
k=4
Anna is filling a 2.5 gallon bathroom sink at a rate of 0.25 gallons per minute. what is the domain of the function that represents the volume of water in the sink after x minutes?
The volume of water in the sink after x minutes can be represented by a function V(x) = 0.25 x and its domain is 0 ≤ x ≤ 10
After x minutes, the volume of water in the sink will be:
V = filling rate ⨉ time interval
Information from the problem:
filling rate = 0.25 gallons per minute
time interval = x
Substitute these parameters into the formula:
V = 0.25 x
The domain of a function is the set of all possible inputs, of which the function is defined.
In this problem, the function is the volume, which is a function of x.
V(x) = 0.25 x
To determine its domain, check the minimum and maximum values of V(x).
When the sink is empty, V = 0.
Then,
V(x) = 0.25 x
0 = 0.25 x
x = 0
When the sink is full, V = 2.5.
Then,
V(x) = 0.25 x
2.5 = 0.25 x
x = 10
Since V(x) has value 0 ≤ V(x) ≤ 2.5, its corresponding input should be 0 ≤ x ≤ 10. This is the domain.
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Differentiate the following equation [tex]sin^2(\frac{\pi }{6} -x)[/tex]
[tex]\sin^2\left(\frac{\pi }{6}-x \right)\implies \left[ ~~ \sin\left(\frac{\pi }{6}-x \right) ~~ \right]^2 \\\\\\ \stackrel{\textit{\LARGE Chain Rule}}{2\left[ ~~ \sin\left(\frac{\pi }{6}-x \right) ~~ \right]^1 \left[ ~~ \cos\left(\frac{\pi }{6}-x \right) ~~ \right] (-1)}\implies \boxed{-2\sin\left(\frac{\pi }{6}-x \right)\cos\left(\frac{\pi }{6}-x \right)}[/tex]
If 8 tacos cost $5.60. Find the unit price. Round to the hundredths if necessary.
Answer:
0.7¢
Step-by-step explanation:
Find unit price[tex]8 \cdot 7 = 56\\= 56 - 56\\= 0.7\:\mathrm{R0}[/tex]
(2-a)³+(2-b)³+(2-c)³-3(2-a)(2-b)(2-c)
Pls step by step
The evaluation of (2-a)³+(2-b)³+(2-c)³-3(2-a)(2-b)(2-c) is mathematically given as
a^3+3 a b c-b^3-c^3+6 a^2-6 a b-6 a c+6 b^2-6 b c+6 c^2
This is further explained below.
What is the evaluation of (2-a)³+(2-b)³+(2-c)³-3(2-a)(2-b)(2-c)?(2-a)^3+(2-b)^3+(2-c)^3-3(2-a)(2-b)(2-c)
Use the Binomial Theorem.
2^3+3 * 2^2(-a)+3*2(-a)^2+(-a)^3 +(2-b)^3+(2-c)^3 -3(2-a)(2-b)(2-c)
8-12 a+6 a^2-a^3+(2-b)^3+(2-c)^3 -3(2-a)(2-b)(2-c)
Use the Binomial Theorem.
8-12 a+6 a^2-a^3+2^3+3 * 2^2(-b)+3 * 2(-b)^2+(-b)^3+(2-c)^3-3(2-a)(2-b)(2-c)
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3 +(2-c)^3-3(2-a)(2-b)(2-c)
Use the Binomial Theorem.
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3+2^3+3 \cdot 2^2(-c)+3 \cdot 2(-c)^2+(-c)^3-3(2-a)(2-b)(2-c)
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3 +8-12 c+6 c^2-c^3-3(2-a)(2-b)(2-c)
Apply the distributive property.
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3+8-12 c+6 c^2-c^3+(-3 * 2-3(-a))(2-b)(2-c)
Multiply -3 by 2 .
&8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3+8-12 c+6 c^2-c^3 +(-6-3(-a))(2-b)(2-c)
Multiply -1 by -3.
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3 +8-12 c+6 c^2-c^3 +(-6+3 a)(2-b)(2-c)
Expand (-6+3 a)(2-b) using the FOIL Method.
Combine the opposite terms in
8-12 a+6 a^2-a^3+8-12 b+6 b^2-b^3+8-12 c+6 c^2-c^3-24+12 c+12 b-6 b c+12 a-6 a c-6 a b+3 abc
8+6 a^2-a^3+8+6 b^2-b^3+8+6 c^2-c^3-24-6 b c-6 a c-6 a b+3 abc
Simplify by adding numbers.
6 a^2-a^3+6 b^2-b^3+24+6 c^2-c^3-24-6 b c-6 a c-6 a b+3 abc
Combine the opposite terms in
6 a^2-a^3+6 b^2-b^3+24+6 c^2-c^3-24-6 b c-6 a c-6 a b+3 a b c
6 a^2-a^3+6 b^2-b^3+6 c^2-c^3-6 b c -6 ac-6 ab+3 abc
Re odrder
a^3+3 a b c-b^3-c^3+6 a^2-6 a b-6 a c+6 b^2-6 b c+6 c^2
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How do I solve this? step by step please 30 POINTS!
The solution to the system of equations is (-7, 5)
What are linear equations?Linear equations are equations that have constant average rates of change. Note that the constant average rates of change can also be regarded as the slope or the gradient
How to determine the solution to the system?A system of linear equations is a collection of at least two linear equations.
In this case, the system of equations is given as
2x + y = -9
3x + 5y = 4
Make y the subject in 2x + y = -9
So, we have
y = -2x - 9
Substitute y = -2x - 9 in 3x + 5y = 4
So, we have
3x + 5(-2x - 9) = 4
Open the bracket
So, we have
3x - 10x - 45 = 4
Evaluate the like terms
-7x = 49
Divide both sides by -7
x = -7
Substitute x = -7 in y = -2x - 9
y = -2(-7) - 9
Evaluate
y = 5
Hence, the solution to the system of equations is (-7, 5)
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cant focus today lolol pls help
Answer:
18.48
7.39 divided by 0.4 is 18.475
rounded to hundredth is 18.48 because 5 or above you round up
Answer:2.909
Step-by-step explanation:hope this helps
Find the coordinate of the midpoint of the segment with the given endpoints.
-6 and -4
Answer:
-5
Step-by-step explanation:
Let's assume the you are moving horizontally along the number line. If you start at -4 and jump to -6, you have made 2 jumps to the left(-4;-5;-6). So halfway between them (the midpoint) is 1 jump (half of 2 jumps).
1 jump to the left of -4.... You land at -5.
Schweet!
what is the imagine point of (0,-9) after a translation right 5 units and down 1 unit
the image of the point ( 0 , - 9 ) after a translation of right 5 units and down 1 unit will be ( 5 , - 10 ).
We are given a point:
( 0 , - 9 )
We will first translate it to the 5 units right.
So, we get that:
( 0 + 5 , - 9)
= ( 5 , - 9)
Now, we will translate it 1 unit to the down.
So, we get that:
= ( 5 , - 9 - 1)
= ( 5 , - 10 )
Image will become:
( 5 , - 10 )
Therefore, we get that, the image of the point ( 0 , - 9 ) after a translation of right 5 units and down 1 unit will be ( 5 , - 10 ).
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Find the derivative of the function using the definition of derivative. f(x) = 5x
The derivative is f'(x) = 5.
The limit definition of the derivative tells us that the derivative of a function is f is
f' (x) = [tex]\lim_{h \to \0} 0[/tex] [tex]\frac{f(x+h)-f(x)}{h}[/tex]
For this, f(x) = 5x and f(x + h) = 5(x + h)
So:
f'(x) = [tex]\lim_{h \to \}0[/tex] [tex]\frac{5(x+h)-5x}{h}[/tex]
= [tex]\lim_{h \to \}0[/tex] [tex]\frac{5x+5h-5x}{h}[/tex]
= [tex]\lim_{h \to \}0[/tex] [tex]\frac{5h}{h}[/tex]
= [tex]\lim_{h \to \}0[/tex] 5
= 5
So, when f(x) = 5x , we see that its derivative is f'(x) = 5.
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state which is greater
(5-6) times 10 or 5-6 times 10
question 4 suppose the fraction of high school students who can drive is 15% and the fraction of college students who can drive is 23%. if one-fifth of the students are college students and the rest are high school students, what is the probability that a student who can drive is a college student? select the correct probability.
The probability that a student who can drive is a college student is 0.2771 or 27.7%
It will be sooved using Baye's theorem -
P(college) = P(C) / 1/5 = 0.2
P(high school students) = P(H) = 4/5 = 0.8
P(college drives) = 0.23
P(high school drives) = 0.15
We have to find, probability that a student who drives is a college student.
That is, we have to find P(C/D).
P(C/D) = P(C ∩ S)/P(S)
Since P(C ∩ S) is an independent event.
P(C ∩ S) = P(C) × P(S)
P(C ∩ S) = 0.2 × 0.23
= 0.046
Using bayes's theorem, we will get
P(C/D) = 0.2771 or 27.7%
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∠A and \angle B∠B are vertical angles. If m\angle A=(5x+1)^{\circ}∠A=(5x+1) ∘ and m\angle B=(4x+3)^{\circ}∠B=(4x+3) ∘ , then find the value of x.
HELP
Using the vertical angles theorem, the value of x = 2.
How to Apply the Vertical Angles Theorem?Given that angles A and B are vertical angles pair, based on the vertical angles theorem, both angles are congruent to each other.
Therefore:
m<A = m<B [vertical angles theorem]
m<A = (5x + 1)°
m<B = (4x + 3)°
Substitute
(5x + 1)° = (4x + 3)°
Solve for x
5x + 1 = 4x + 3
5x + 1 - 1 = 4x + 3 - 1
5x = 4x + 2
5x - 4x = 4x + 2 - 4x
x = 2
Therefore, using the vertical angles theorem, the value of x = 2.
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Cecilia bought 187.6 pounds of crushed limestone in a total of eight bags. if all the bags were identical, what was the weight of each?
The weight of each bag is 23.25 pounds.
For given question,
Cecilia bought 187.6 pounds of crushed limestone in a total of eight bags.
If all the bags were identical, we need to find the weight of each bag.
Let 'm' be the weight of each bag.
As Cecilia bought 187.6 pounds of crushed limestone in a total of eight bags and all the bags were identical, we get an expression.
8 × m = 187.6
now we solve above expression to find the value of m i.e., to find the weight of each bag.
⇒ 8 × m = 187.6
⇒ m = 187.6 / 8
⇒ m = 23.25 pounds
Therefore, the weight of each bag is 23.25 pounds.
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The standard deviation for a data set is 0. Determine whether each conclusion about the data is true or false.
a. The standard deviation measures the variation of the data. If the standard deviation is 0, then there is some variation, so all the data are different.
b. All the data must be equal to the mean because the sum of the squares of the differences of the data from the mean is 0. So, all the data take the same value.
Statement a : "The standard deviation measures the variation of the data. If the standard deviation is 0, then there is some variation, so all the data are different" is false.
Statement b : "All the data must be equal to the mean because the sum of the squares of the differences of the data from the mean is 0. So, all the data take the same value" is true
What is standard deviation?
This is a term in statistics that represent the amount of variation in a data set or simply put the spread of the data set. Standard deviation is solved from the mean of the data, that is we get mean first before solving for standard deviation.
From the definition, if all the data is the same then the data should be equal to the mean. If the data is equal to the mean there will be no spread or variation leading to a zero standard deviation.
Hence we can conclude that statement b is true and statement a is false
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3 cups of peanut mix 2 cups of raisins 4.5 cups of peanut mixed 3 cups of raisins are the ratios equivalent for two mixed
The ratios are equivalent
How to find equivalent ratios?Ratio shows the relationship that exists between values. It shows the proportion of one value in another value.
In other words, ratios says how much of one thing there is compared to another thing.
Therefore,
Ratio of peanuts to raisins in the first version = 3 : 2
divide both numbers by 2
1.5 : 1
Ratio of peanuts to raisins in the second version = 4.5 : 3
divide both numbers by 3
1.5 : 1
The ratios of the first and second trail mix are equivalent because they are both 1.5 : 1
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2. Which graph represents the solution
of 6 + 3y < 9 or 4y > 3y + 2?
Help please!!!!!
Answer: It is likely B
Step-by-step explanation:
1. Subtract 6:
6 -6 + 3y < 9 -6
2. Divide by 3:
3y/3 < 3/3
3. Simplify:
y < 1
--------------------------------------
1. Subtract 3y:
4y -3y < 3y -3y + 2
2. Simplify:
y < 2
(i) So the answer is likely B
Alguien me puede ayudar pls
Answer:
hola
Step-by-step explanation:
please help I will give brainly if its right
A cylinder (round can) has a circular base and a circular top with vertical sides in between. Let r be the radius of the top of the can and let h be the height. The surface area of the cylinder, A , is A=2πr2+2πrh (two circles, one for the top and one for the bottom plus a rolled up rectangle for the sides).
A round cylinder with a circle top and base with radius r and a height of h
Part a: Assume that the height of your cylinder is 8 inches. Consider A as a function of r , so we can write that as A(r)=2πr2+16πr. What is the domain of A(r) ? In other words, for which values of r is A(r) defined?
Part b: Continue to assume that the height of your cylinder is 8 inches. Write the radius r as a function of A. This is the inverse function to A(r) , i. E. , to turn A as a function of r into r as a function of A.
r(A)=
Preview Change entry mode
Hints:
To calculate an inverse function, you need to solve for r. Here, you would start with A=2πr2+16πr. This equation is the same as 2πr2+16πr−A=0 which is a quadratic equation in the variable r , and you can solve that using the quadratic formula. You will want to keep A as a variable when you plug the values into the quadratic formula.
If you want to type in 3π+1x+1 in Mobius, in text mode you can type in (3*pi+1)/(x+1). There is more information in the Introduction to Mobius unit.
Part c: If the surface area is 100 square inches, then what is the radius r ? In other words, evaluate r(100). Round your answer to 2 decimal places.
Hint: To compute a numeric square root such as 17. 3−−−−√ , you could
Use a spreadsheet such as Microsoft Excel or OpenOffice Calc and type in =sqrt(17. 3)
Use a browser to connect to the Internet and type in sqrt(17. 3) into a search field
Use a calculator
The radius is
inches if the surface area is 100 square inch
a) r>0 is the domain of A. b) r = (4/2π + 16)^1/2 - 4
A(r) is a function representing the surface area of a cylinder of height = 8inches and radius = r.
A(r) = 2п[tex]r^{2}[/tex] + 16пr
r must be a positive number, as we can't have a radius of negative length, so the domain of A(r) is r>0.
Solving for r in terms of A is an odd question, and a little challenging but possible using completing the square:
A/2п = [tex]r^{2}[/tex] + 8r
A/ 2п + 16 = [tex]r^{2}[/tex] + 8r + 16
A/2п + 16 = [tex](r + 4)^{2}[/tex]
r =( A/2п + 16) ^1/2 - 4
Therefore we get to know the range of r i.e., r>0 and radius = (A/2п + 16 )^1/2 - 4
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A point at the origin is repeatedly translated c units horizontally and d units vertically. Write the coordinates
of the translated point if the translation sequence is repeated n times.
The coordinates of the translated points if the translation sequence is repeated n times according to the task content is; (nc, nd).
What are the coordinates of the translated point after n translation sequences?It follows from the task content that the point in discuss is at the origin. Hence, the point is; (0, 0).
Also, since the point is repeatedly translated c units horizontally and d units vertically, it follows from transformations that the resulting point is;
((0+c), (0+d))
Ultimately, when the translation sequence is repeated n times; the resulting pair of coordinates is; ((0+nc), (0+nd)).
And upon simplification, we have; (nc, nd).
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Hi, could I get help with this?
The segment AB is perpendicular to the segment CD because the two angles it creates are each 90 degrees .
A line is said to be perpendicular to another line if the two lines intersect at a right angle . The segment AB can be called the perpendicular from A to the segment CD . The point B is called the foot of the perpendicular from A to segment CD or simply , the foot of A on CD .If a first line is perpendicular to a second line , then the second line is also perpendicular to the first .
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Just the answer please
The x-intercept of the line is -3
y-intercept: None
x-intercept and y-interceptFrom the question, we are to find the y-intercept and x-intercept of the given line
The x-intercept of a line is the point where the line crosses the x-axis on a cartesian plane
The y-intercept of a line is the point where the line crosses the y-axis on a cartesian plane
From the graph, we can observe that the line only crosses the x-axis at the point (-3, 0). That is, at the point where x = -3
Thus,
The x-intercept of the line is -3
The graph does not cut through the y-axis
Thus,
There is no y-intercept
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I need to know What is 3/4 x 8 1/2
Answer:
3/4 x 8 1/2 = 6.375
Albert bought 6 bags of candy. There were 7 pieces of candy in each bag. How many pieces
of candy did Albert buy?
pieces of candy
42 pieces of candy because math
If m< EBC = 3y+10 and m< ABE = 2y-20, find m< EBF.
By using the fact that EBC and ABE are supplementary angles, we will see that the measure of angle EBF is 106 degrees.
How to find the measure of the angle EBF?First, we can notice that angles EBC and ABE are supplementary angles, which means that their measures add up to 180°.
Then we can write:
m∠EBC + m∠ABE = 180°
Replacing what we know we get:
3y + 10 + 2y - 20 = 180°
Now we can solve this linear equation for y, we will get:
5y - 10 = 180
5y = 180 + 10
y = 190/5 = 38
Then we have that:
EBC = 3*38 + 10 = 124°
ABE = 2*38 - 20 = 56°
Now, in the image it says that:
ABE = 2b = 56°
then b = 56°/2 = 28°
And ABF = 7b - 24 = 162°
Then:
EBF = ABF - ABE = 162° - 56° = 106°
We conclude that the measure of angle EBF is 106 degrees.
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Select the car that travels the fastest. choose 1 answer: choose 1 answer: (choice a, checked) a 50 50 km/h km/hcar a (choice b) b car b travels a distance of d dd kilometers in h hh hours, based on the equation 55 h = d 55h=d55, h, equals, d. (choice c) c car c travels 135 135135 kilometers in 3 33 hours. see more
The car with the speed of 50 Km/h travels the fastest.
We have given with three choices for selecting the fastest speed from them. The three choices are
First choice is 50 Km/h.
Second Choice is car b travels a distance of d kilometers in h hours, based on the equation 55 h = d , h, equals, d.. So from this be can conclude that this car is moving with the speed of (1/55)km/h.
Third choice is car c travels 135 kilometers in 3 hours. So from this be can conclude that this car is moving with the speed of (135/3) Km/h i.e., 45 Km/h.
So, from the given choices we can conclude that the car with the speed of 50 Km/h travels the fastest.
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The table shows a proportional relationship between x and y. Dimitrios and Katerina have to complete the table. Katerina incorrectly says the ratio is 10 a complete the table. 3 5 7 0 y 30 50 70 90 Ratio y/x
Here is the completed table:
x y y/x
3 30 10 / 1
5 50 10 / 1
7 70 10 / 1
9 90 10 / 1
What are the ratios?Ratio expresses the relationship between two or more numbers. It shows the number of times that one value is contained within other value(s). The sign used to represent ratios are :.
The ratio of y to x : change in value of y / change in the value of x
(50 - 30) / (5 - 3) = 20 / 2 = 10 / 1
(70 - 50) / (7 - 5) = 20 / 2 = 10 / 1
(90 - 70) / (9 - 7) = 20 / 2 = 10 / 1
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g(x)= 3x find g(-5)
Answer: -15
Step-by-step explanation:
x=-5
g(-5)=3(-5)
g(-5)=-15