Academic Integrity: tutoring, explanations, and feedback — we don’t complete graded work or submit on a student’s behalf.

Identify the important points (critical number and endpoints) needed to find the

ID: 2882640 • Letter: I

Question

Identify the important points (critical number and endpoints) needed to find the maximum and minimum value on the

given closed interval I.

8) r() = 2 cos ; I = [- /4, /3]

A) Important points: - /4, 2, /3; maximum value sqrt(2); minimum value 1

B) Important points: 0; maximum value 2; no minimum value

C) Important points: - /4, 0, /3; maximum value 2; minimum value 1

D) Important points: - /4, 0, /3; maximum value 2; minimum value sqrt(2)

9) g(t) = t^2/3; I = [-1, 8]

A) Important points: -1, 0, 8; maximum value 1; minimum value 0

B) Important points: -1, 8; maximum value 4; minimum value 3

C) Important points: 0; no maximum value; minimum value 0

D) Important points: -1, 0, 8; maximum value 4; minimum value 0

Explanation / Answer

8) A

as cos varies from 1/sqrt(2) to 0.5 in the interval [- /4, /3]

that imples maximum value of 2cos = 2*1/sqrt(2) = sqrt(2)

and the minimum value = 2*0.5 = 1

9) D

g(t) = t^2/3 I = [-1, 8]

at 8 g(t) = maximum = 4

and at 0 g(t) = minimum = 0