The function:
f ( x ) = x * 0.965^t
where x is the initial amount and t is the number of the years
80 = x * 0.965^3
80 = x * 0.89632
x = 80 : 0.89632 ≈ 89
Answer:
The initial amount of animals was 89.
First off, see how much 8700 as principal, yields at 3% APR
that is

it will yield some amount
subtract that amount from 393
the difference is how much the yield will be on the 6% investment
so

Your answers are 15 16 and 17 they should be right
We have to functions, namely:

So the problem is asking for the smallest positive integer for

so that

is greater than the value of

, that is:

Let's solve this problem by using the trial and error method:

So starting

from 1 and increasing it in steps of one we find that:

when

That is,
the smallest positive integer for

so that the function

is greater than
is 4.
Answer:
28z-12y
Step-by-step explanation: