An executive invests $22,000, some at 6% and the rest at 5% annual interest. If he receives an annual return of $1,200, how much is invested at each rate?

The volume of a cube is 8 in to the 3rd power. how long is each side?

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?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a