Please help me out here. Solve the system of equations algebraically. You must show your work to receive full credit.

Cindy uses 1-inch cubes to find the volume of a jewelry box shaped like a rectangular prism. she uses 780 cubes to completely fill the jewelry box with no gaps or overlaps. if the jewelry box is 13 inches long and 5 inches wide, how tall is cindy’s jewelry box?

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6

For each proportion find the unknown number x 1/5/8=×/15