Can you please answer this question I am stuck and I need it for plato

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16