How do you subtract negatives and positives numbers? (example)

Asap! i need this done today and i really don’t understand it. some one ! will mark

9000 dollars is placed in an account with an annual interest rate of 8%. how much will be in the account after 17 years, to the nearest cent?

The diagram shows the lengths of corresponding sides of similar triangles a'b'c' and abc. which expression gives the perimeter of a'b'c'? a. 4(4 + b + c) b. 2(a + b + c) c. 4(a + b + c) d. 8(a + b + c)