A tire is slowly deflating. The graph below shows the pounds per square inch (psi) of pressure as a function of time. Tire Pressure
36
34
Pressure (psi)
32
30
28
2
6
8 10 12 14 16
Time (minutes)
At what rate, in psi/minute, is the tire deflating?

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution