If the point (a, 7) lies on the graph of the equation 5x - y = 8, then a= -3 3 1/5 plz help

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

How are algebraic expressions evaluated using substitution?