A chemist begins studying a radioactive sample that has a mass of 450 grams.
sample decays at a rate of 6.7% each week. How much of the sample is left in
weeks? Round your answer to 2 decimal places.
A)287.74
B)301.19
C)332.06
D)318.14

The question should say How much of the sample is left inFIVEweeks? At least that is what I think you want to know.

The answer is 318.13 grams.

Step-by-step explanation:

450 - 6.7% = 419.85 grams End of week 1

419.85 - 6.7% = 391.72 grams End of week 2

391.72 - 6.7% = 365.47 grams End of week 3

365.47 - 6.7% = 340.98 grams End of week 4

340.98 - 6.7% = 318.13 grams End of week 5

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !