Please answer need help for a quiz

What is the product of the radical expression. (7-2square root) (8+2 square root)

How many grams must be adde to 970g to make 1 and a half kg

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