Answer: 4, 2
Explanation:
This is a sine/cosine wave.
we can see one full revolution from 0 to 4; this means that the period is 4.
the amplitude refers to how "high" or "low" the graph goes from its center.
we can see it hits a maximum of 2, (and a minimum of -2). Since the amplitude is the absolute value of this high/low value, it will always be positive. so the amplitude is 2
In conclusion:
Period = 4
Amplitude = 2