(3a2)(5a3)
how to simplify this?

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 and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?