If of a number is 56, what was the original number

Need on this geometry question. explain how you did it.

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?