Question

Just need help with number 3. Please. Thankyou! Been stuck on this one for a while now.

Answer 1

A cosine function is given in the form:

`y=A\cos(x-h)+k`

where |A| is the amplitude, h is the horizontal shift (also called a phase shift) and k is the vertical shift.

The function is given to be:

`\begin{gathered} y=8\cos((1)/(4)x) \\ A=8 \end{gathered}`

Therefore, the amplitude is 8.