Answer:
2.5 half-lives
Step-by-step explanation:
Find 
in 
given 
is the amount after the time 
, 
`is the initial amount, is the half-life
We know that after half-life there will be twice less the initial quantity:
.
Simplifying gives 
Plugging this into the initial equation, we obtain that 
or 
Finally, just plug in the given values and find the unknown one.
From 
, we have that 
= 
So you should get: 
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C and E, evaluate the numbers outside of the parenthesis to the inside
Its letter C because you have to do the opposite of division and multiply both sides by -8.
-5 multiplied by -8 is 40
and beacuse you multiplied negative number you flip the sign
D. The "a" value stretches the function vertically by a factor of absolute value of a.
