26% of 492? i'm trying find this out can someone help me

What is the value of this expression when b= 5 6 (2b-4)

What is the value of y? round to the nearest tenth

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