You can't do that in less the 40 is over 16
Answer: 
Step-by-step explanation:

Remove all those parentheses by multiplying. Note: 2 and 2 cancel out.

Subtract 2x

Combine like terms;

Divide by -3

Rewriting it;


the earned interest will then be A - P, namely A - 17000.
Well I'm still trying to solve the first question so I'll tell you the other answers
the answer for the second question is :

and for the third question :
10, because 10 does not need to be rounded to the nearest 10 if the number is already 10, but if the number was 17 then rounding to the nearest 10 would be 20