Evaluate the expression given the replacement values.

8x−2y for x=4 and y=−7.
10xy

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?

In september, louise planted a tree. every month, the tree louise planted grew 2 inches. what would the constant of proportionality of the line be?