Answer: 50 minutes
Answer choices:
20 minutes
70 minutes
50 minutes
30 minutes
It will take 68.8 minutes for a 100-gram sample of francium-223 to decay to 20 grams.
What is an equation?An equation contains one or more terms with variables connected by an equal sign.
Example:
2x + 4y = 9 is an equation.
2x = 8 is an equation.
We have,
The decay of a radioactive substance can be modeled by the exponential decay formula:
[tex]N(t) = N_0 ~ e^{-ct}[/tex]
where:
N(t) is the amount of the substance at time t
N0 is the initial amount of the substance
c is the decay constant
t is the time elapsed since the initial measurement
The half-life of francium-223 is about 22 minutes.
t = 22
Now,
0.5 = [tex]e^{-c \times22}[/tex]
ln (0.5) = -c x 22
c = ln(2) / 22
c ≈ 0.03159
Now,
We can use the formula to solve for the time it takes for the sample to decay from 100 grams to 20 grams.
20 = 100 x [tex]e^{-0.03159t}[/tex]
[tex]e^{-0.03159t}[/tex] = 0.2
-0.03159 t = ln(0.2)
t = ln(0.2) / (-0.03159)
t = 68.8 minutes
Therefore,
It will take 68.8 minutes for a 100-gram sample of francium-223 to decay to 20 grams.
Learn more about equations here:
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Can some one help me out my grades are bad
Answer:
Go to the bottom of that problem and click save for later
Can someone please help mweeeeeee
Answer:
D
Step-by-step explanation:
180 degrees in a triangle
102+(x+6)+(x+15)=180
remove parenthesis and combine like terms
123+2x=180
subtract 123 from both sides
2x=57
divide
x=28.5
substitute x for its actual value
28.5+6
angle A= 34.5
28.5+15
angle B= 43.5
The list below shows the number of train tickets sold each
week during an eight-week period.
2945, 4572, 3560, 3359, 4089, 2841, 3283,
4266
What is the range of the data?
Answer: The range is 1731
Step-by-step explanation: lowest number 4572- 2841 highest
The blue segment below is a diameter of O. What is the length of the radius of the circle? ASAP!!
Answer: The radius is 3.7 units
Step-by-step explanation:
Question 5:Solve for a Side
Find the missing side. Round to the nearest tenth.
Find the measure of the missing angle.
Answer: a= ______
(NO FILES) IF YOU ANSWER YOU WILL BE MARKED BRAINLIEST :)
Answer:
a= 32
Step-by-step explanation:
Since "a" is a part of a supplementary angle (An angle that adds up to 180º)
What you would need to do is add 58º and 90º (90º because the right angle = 90)
so 58+90 = 148
Then you would subtract 148 from the total of the angle (Which is 180)
so 180 - 148 = 32, And that shows that a = 32
(P.S. THE BOTS THAT POST THE LINKS TO THE FILES ARE POSTING MALWARE AND VIRUSES, DO NOT DOWNLOAD ANYTHING FROM THEM THEY ARE VIRUSES. IF YOU HAVE DOWNLOADED ANYTHING, GET A RELIABLE ANTIVIRUS SOFTWARE AND SCAN YOUR COMPUTER)
pls help ill mark brainlist
2(5×2+2×2+2×5)
ans- 48cm²
can anyone help me find keirston03?
Answer:
I'm pretty sure this is them, right???
https://brainly.com/app/profile/26203419/answers
Answer:
hey im so sorry havnt been on in a while. its a really long story. i hope youre doing good tho!! miss you!
Step-by-step explanation:
Monique's swimming pool filter needs repair. She calls two companies for prices. The
Pool Boyz charge $70 for a service call and $40/h for labour. Kemikal Balance charge
$50 for a service call and $45/h for labour.
a) Write a linear equation for each company.
b) Find the solution to this linear system
3 There are 4 quarts in a gallon. Which function models the number of quarts in x gallons? A h(x) = 0.25% B h(x) = 4x C h(x) = x +4 D h(x) = X What is the answer you can help me ?
Answer:
[tex]h(x) = 4x[/tex]
Step-by-step explanation:
Given
[tex]4\ qt \to 1\ gallon[/tex]
Required
Number of quarts in x gallon
This can be represented as:
[tex]h(x) \to x\ gallon[/tex]
So, we have:
[tex]4\ qt \to 1\ gallon[/tex]
[tex]h(x) \to x\ gallon[/tex]
Cross Multiply
[tex]h(x) * 1\ gallon = 4 * x\ gallon[/tex]
[tex]h(x) * 1 = 4 * x[/tex]
[tex]h(x) = 4x[/tex]
Rei is barricading a door to stop a horde of zombies. She stacks boxes of books on a table in front of the door. Each box weighs 30 kilograms, and the table with 8 boxes on top weighs a total of 310 kilograms.
The total weight W of the barricade in kilograms is a function of x, the number of boxes Rei stacks on the table.
Write the function's formula.
W =
Answer:
240?
Step-by-step explanation:
I need help with this one could anyone help
Answer:
the formula to use is A
hope it helps
Maya owns a house valued at $432,600. She still owes $233,458 on her mortgage. How much equity does she have in the house? (3 points)
Answer:
$199,142
Step-by-step explanation:
Given that
The value of the house i.e. assets is $432,600
The mortgage i.e. liability is $233,458
We need to find out the equity
As we know that
The accounting equation is
Total assets = Total liabilities + total equity
$432,600 = $233,458 + total equity
So, the total equity is
= $432,600 - $233,458
= $199,142
Answer:
No, she is not correct. She has only $30,000 in home equity. Equity is the value of ownership in an asset minus any debts owed on it. $315,000 minus $285,000 is $30,000.
Step-by-step explanation:
Took it straight from EDG 2022
GEOMETRY! WILL GIVE BRAINLIEST! Please answer and explain, thank you!
Answer:
40
Step-by-step explanation:
The measure of an inscribed angle is half the measure of the intercepted arc.
So, 80/2 = 40
solve the equation 5= w + 1 1/2
PLS I NEED HELP
a
3
b
3.5
c
4
d
4.5
Solve for w by simplifying both sides of the equation, then isolating the variable.
Exact Form: w = 7 2 w = 7 2
Decimal Form: w = 3.5 w = 3.5
Mixed Number Form: w = 3
final answer: choice Bb. 3.5
Step-by-step explanation:The choices are:
a. 3
b. 3.5
c. 4
d. 4.5
The equation is 5 = w + [tex]1\frac{1}{2}[/tex]
5 - [tex]1\frac{1}{2}[/tex] = [tex]3\frac{1}{2}[/tex]
w = [tex]3\frac{1}{2}[/tex]
[tex]3\frac{1}{2}[/tex] converted into a decimal equals 3.5
So the correct answer is b. 3.5
Hope this helps!-FinnySolve the following quadratic function
by utilizing the square root method.
y = 9x2 - 36
X =
= + [?]
Answer:
x=2 or -2
Step-by-step explanation:
You can refer to the photo I attached
Help pleaseee?? Yuhh
Answer : Copy the question into brainly search bar and get youre answer.
PLS HELP DO NOT DO FAKE OR JUST FOR POINTS . DO THIS SEIOUSLY IF YOU HAVE COMMENT COMMENT DO NOT ANSWER.
PLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLSPLS PLS PLS PLS PLS
Answer:
What is the question? If you comment the question i may be able to help
Step-by-step explanation:
A rectangle has a length of
381
and a width of 33 inches. Find the area of the rectangle. (2 points)
What is the best description of the relationship in the scatterplot below?
Chose 1 answer
A- positive linear association
B- negative linear association
C-Nonlinear association
D- no association
Answer:
a becuase it is just a so if you get that wroung dont blem me lol
Step-by-step explanation:
Answer:
A - Positive linear association
Step-by-step explanation:
You can see that the overall direction of the graph is going up, therefore, this graph has a postivie association.
2(4K + 7)
Helppp lol
Answer:
8k + 14
Step-by-step explanation:
2(4K + 7)
8k + 14
PLEASEEEEEE HELPPPPPPPP MEEEEEEEEEEEEEEEEEEEE
x = 5
z = 106
Step-by-step explanation:
a)
(10x + 24) + 106 = 180
10x + 130 = 180
10x = 50
x = 5
b) z = 106 (from the definition of vertical angles)
it snowed 14 cm in 5 hours. what is the unit rate
Answer:
2.8cm per 5 hours
Step-by-step explanation:
simplify by using the law of indices:
y^a(b+c)×y^b(c-a)×y^c(a-b)
Answer:
[tex]y^{2ac}[/tex]
Step-by-step explanation:
Using the law if indices
[tex]a^{m}[/tex] × [tex]a^{n}[/tex] = [tex]a^{(m+n)}[/tex]
Thus to simplify the expression add the 3 exponents
a(b + c) + b(c - a) + c(a - b) ← distribute parenthesis
= ab + ac + bc - ab + ac - bc ← collect like terms
= 2ac
Then the expression simplifies to
[tex]y^{2ac}[/tex]
please help!!!!!!!!!!
Answer:
Positive
Step-by-step explanation:
what is greater -4 squared or -1 to the power of 3
Answer:
-1³ is greater than -4⁴ ok bye welcome❣
The rest of the drawers are 3.5 by 1.25 by .75 ft.
what is the volume of these drawers?
Answer:
3.28125 cubic feet
Step-by-step explanation:
3.5 x 1.25 x 0.75 = 3.28125 cubic feet
which statement is the best example of the chemical weathering of water
if u subtract 12 from a number and multiply the result by 12 you get 18. what is the number
Answer:
27/2 is the value of the number.
Let the number be x.
According to the question,
12(x-12)=18
x-12=18/12
x-12=3/2
x=3/2+12
x=3/2+24/2
x=27/2
HOPE IT HELP :)
Answer:
13.5 27/2 13 (1/2) all the same
Step-by-step explanation:
(x-12)x12 = 18
12x-144 = 18
12x = 162
x = 162/12 = 27/2 = 13(1/2) = 13.5
What is the measure of ZP
609
x 80°
F
40°
H
100
80
90°
40°
Answer:
100 degrees
Step-by-step explanation:
angle x is next to 80. the sum of angles that form a straight line = 180 degrees. So, 180-80 =100 degrees