Answer:
-3,2
Step-by-step explanation:
Answer: 19 years
Step-by-step explanation:
Given
Amount invested 
Rate of interest 
after 1-year amount becomes

After n years it is

Sum accumulated is 

First you have to set up your equation. 5x+80 and x+15.
Answer:
5
Step-by-step explanation:
3x -12 = -36
-36 ÷ -3 = 12
-7 + 12 = 5
Answer: 1
Step-by-step explanation: