15/7 divides by 42/7 equals 357/1000 or .357
Answer:

Step-by-step explanation:
Equation to remember:
where t = time
= 1200 since that's the initial population
= .35 rate of change \\
= 5 years
Plug in the numbers;

Since the prompt looks like it's asking for an equation given any number of years.. then just change 5 to n for number of years.

27+3x-31=20
-4+3x=20
+4 +4
3x=24
X=8
B) y = -2x
when x = a
y = -2a
when x= 2a
y = -2(2a) = -4a