John deposited $80 in a savings account earning 5% interest, compounded annually. to the nearest whole dollar, how much interest will he earn in 3 years?

The interest is equal to

Step-by-step explanation:

we know that    

The compound interest formula is equal to  

where  

A is the Final Investment Value  

P is the Principal amount of money to be invested  

r is the rate of interest  in decimal

t is Number of Time Periods  

n is the number of times interest is compounded per year

in this problem we have  

substitute in the formula above  

Find the interest

Round to the nearest whole dollar

the answer will be b x² +x-1

step-by-step explanation:

35x 3= 105

step-by-step explanation:

35+35= 70   70 + 35= 105