Question 21 of 45 In the triangle below, what is the length of M?
18
20
500
50°
L
N
O A. 50
O B. 100
O c. 20
O D. 40

Step-by-step explanation:

Average rate of change is the same thing as the slope. This is a quadratic so the slope is not something that is constant like it is in a line. Here you have the x coordinates of 1 and 5; each one of these x coordinates has a y coordinate that goes with it. If we draw a line from one of these coordinates to another,  that line will have a slope. That is the slope we are trying to find. Thus, we need the y coordinates that go with each of these x coordinates. To do that, plug x into the equation and do the math to find y:

Let's start with x = 1.

f(1) = so

f(1) = 16 and the coordinate is (1, 16).

f(5) = so

f(5) = -8 and the coordinate is (5, -8). Now we apply the slope formula:

So the answer is -6.