Please answer worth 30 points

6.3x+14 and 1.5x-6 answer in simplified form

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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