An elevator began at an elevation of 85.5 feet and ascended at a rate of 2.75 feet per second. What was the elevation of the elevator after 8 seconds?

With number 11 ( show how you got the answer)

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.

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|