Find missing values! don’t give me a bs answer plz and no links it’s a test i need help

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?