Plz help i suck at math

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

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Put the equation in slope intercept form by solving for y