Can someone help me on this question?

Darian wants to build a regulation size pool table that is 9 feet in length. he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table

Which expression is the factorization of x^2+10+21

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work