A line labeled h(x) is on the xy coordinate plane. The line enters the viewing window in the second quadrant, goes down and to the right. As it travels, the line passes through the following points:
(-15, 50)
(-10, 40)
(-5, 30)
(0, 20)
(5, 10)
(10, 0)
(15, -10)
(20, -20)
(25, -30)
(30, -40)
The line exits the window in the fourth quadrant.
(a) Estimate h(15).
h(15) =
(b) Estimate h(20).
h(20) =
(c) Estimate x such that h(x) = 30.
x =