sarah work at a concession stand for 2 hours and erans 22.50$, but if she works for 4 hours she earns $45. what is the rate of change

$15.50/(2 h) = $7.75/h = $31.00/(4 h)

Sarah makes $7.75 per hour.

While you might be interested in hours per dollar, the customary way to express earnings is in dollars per hour. Either is a "rate of change."

(-1,-0.5)

step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.