Answer:
3.48
Step-by-step explanation:
The problem gives us an initial value of 87 (when x=0) and tells us that it decreases by 80% as x increases by 1. From this we can deduce that only 20% of the preceding value remains.
So, if x = 1 then 20% of f(0) or 87 will remain,
f(1) = 87 * 0.2 = 17.4 (percentages are evaluated/used in their decimal form; the word "of" tell us that we multiply)
When x = 2, 20% of f(1) will remain,
f(2) = 17.4 * 0.2 = 3.48
Let me know if you have any questions!
