Use compatible numbers to estimate the sum of 322+570

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

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Atriangle has side lengths of x, x+11, and 3x+5. what is the perimeter?