Who wants to be friends 1*1

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

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?