What is x, the length of the diagonal, to the nearest whole number?

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

The anwser cause i do not understand just plez

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project