Answer:

Step-by-step explanation:

It is not necessary that the function decreasing over a given interval always be negative.
A function f(x) (value) decreases as x increases.
This does not mean that value of f(x) is negative.
It can have positive number as range.
10000:100*11=1100 income per year
21000-10000=11000 need to have income
11000:1100=10 years will pass time
Answer:
even I think
Step-by-step explanation:
The answer for this questions would be: D. 120