I have the answers on the paper circled and written already, I just need to know how to do the problems step by step. This is matrix algebra.

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account