Question

what is the amplitude of this cosine curve?
0
1
3
6

Explanation:

Step1: Recall amplitude definition

Amplitude = $\frac{\text{Max } y - \text{Min } y}{2}$

Step2: Identify max/min y-values

Max $y=3$, Min $y=-3$

Step3: Calculate amplitude

$\frac{3 - (-3)}{2} = \frac{6}{2} = 3$

Answer:

3