To find the rate of change of the function, Kevin did the following: x
0-(-1)
2-2.5
1
-0.5
= -2
What was Kevin's mistake?
a)He incorrectly chose (-1, 2.5) as a point on the graph.

b)He incorrectly chose (0, 2) as a point on the graph.

c)He mixed up the numerator and the denominator of the fraction.

d)He subtracted -1 from O when he should have added -1 to 0.

the correct answer is 828.07

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

to complete this square you have to rotate about the origin 270 degrees clockwise.

192/15 = 12.8.

12.8

step-by-step explanation:

192/15 is 12.8.

however, it says to round to the nearest foot, which would equal 13.