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Anarel [89]
3 years ago
14

HELP HELP HELP ASAP PLEASE!!

Mathematics
1 answer:
Lera25 [3.4K]3 years ago
7 0

Answer:

im in this right now, the answer is b

Step-by-step explanation:

please mark brainliest

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A certain compound has a half-life of four days. Write and use an exponential decay function to find the amount of compound rema
dimaraw [331]

Answer:

1.97 ounces

Step-by-step explanation:

-The exponential decay function is given by the formula:

P_t=P_oe^{-rt}\\\\

Given that the half-life is 4 days, we can substitute in the formula to solve the rate of decay for a single half-life:

P_t=P_oe^{rt}\\\\P_t=0.5P_o\\\\\therefore 0.5=e^{-4r}\\\\-4r=In(0.5)\\\\r=0.17329

#Since, 1 week has 7 days, 3 weeks is a 21-day period, thus, t=21.

#We substitute and solve for the amount remaining after 21days of decay:

P_t=P_oe^{-rt}\\\\=75e^{-21\times 0.17329}\\\\=1.97072\\\\\approx1.97 \ oz

Hence, the amount remaining after 3 weeks of decays is approximately 1.97 ounces

4 0
3 years ago
the perimeter of a rectangle is 132 m. the length is 2 meters more than 3 times the width. find the dimensions of the rectangle
Anon25 [30]
2l + 2w = 132
l = 3w + 2

2(3w+2)+2w=132
6w + 4 + 2w = 132
8w + 4 = 132
8w = 128
w = 16

l = 3(16) + 2
l = 48 + 2
l = 50

2(50) + 2(16) __ 132
100 + 32 = 132
7 0
3 years ago
The circumference is 12 mile. What is the diameter?
photoshop1234 [79]

To find the diameter of a circle, using only the circumference, you need to divide the circumference by π, or 3.14.

So in this case, you must divide 12 by 3.14, which gives you 3.82.

I even double checked this, and should be correct then.

8 0
2 years ago
Read 2 more answers
Simplify 12(6)-7(2)+(6-3)
Ber [7]

Step-by-step explanation:

12(6) - 7(2) + (6-3)

48 - 14 + 2

36

5 0
3 years ago
Read 2 more answers
4<br> Select the correct answer.<br> Which of these mappings is a function?
melomori [17]

Answer:

? i need a better explanation for ur questoin

Step-by-step explanation:

3 0
3 years ago
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