Asolar heating system cost $25,000 to install with a yearly operating cost of $300. an electric heating system cost $6,500 to install but incurs a yearly operating cost of $4,000. how many years will pass before the total cost of the solar heating system is less than the total cost of the electric heating system?

49xy +34y - 72z. determine the degree of the polynomial

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.

What should be done to both sides of the equation in order to solve -5m = -40? a) multiply by -5. b) divide by -5. c) multiply by -40. d) divide by -40.