Question

What are the amplitude, period, and midline of f(x) = −4 cos(2x − 휋) + 3?

Amplitude: −4; period: pi over 2; midline: y = −4

Amplitude: −4; period: 휋; midline: y = −4

Amplitude: 4; period: 휋; midline: y = 3

Amplitude: 4; period: pi over 2; midline: y = 3

Answer 1

period for the other two with weird symbols are pi

Answer 2

honestly i believe the answer is d @mosaic

Answer 3

For f(x) = Acos(Bx + C)
Amplitude = |A|
Period = 2pi / B

To find the midline, find the lowest value of f(x), find the highest value of f(x) and then find their average.

Answer 4

The answer is D! @mosaic

Answer 5

Almost but not quite. The period is pi and not pi/2

Answer 6

Oh ok

Answer 7

Hey do you think you can help me on other problems because I really want to get this assignment over with. @mosaic

Answer 8

I can try one more b4 logging off.

Answer 9

On which of the following intervals is the function f(x) = 4 cos(2x − π) decreasing?

x = pi over 2 to x = π

x = 0 to x = pi over 2

x = pi over 2 to x = 3 pi over 2

x = π to x = 3 pi over 2

Answer 10

Using calculus?

Answer 11

Hard to help when you won't answer if this problem needs to be solved using calculus or if you have not done calculus yet.

Answer 12

I have never done calculus.

Answer 13

Take each choice. Substitute the end points into f(x) and see if the function increases, decreases or remains the same. For example, the first choice x = pi over 2 to x = π:
Find f(π/2). Find f(π). Compare the two to see if the function is increasing, decreasing or remains the same.

Answer 14

oh ok