If the decay of 742 mg of an isotope is described by the function a(t)= 742e-0.03t, where t is time in years. find the amount left after 84 years. round your answer to the nearest mg. 

The amount left after 84 years is 59.70 mg.                        

Step-by-step explanation:

Given : If the decay of 742 mg of an isotope is described by the function , where t is time in years.

To find : The amount left after 84 years?

Solution :

The function of decay of 742 mg of an isotope is given by,

We have to find the amount left after 84 years.

i.e. put t=84 in the given function,

Therefore, The amount left after 84 years is 59.70 mg.

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right