Question

8.

A particular sound wave can be graphed using the function y = –3 sin x. Find the period of the function.

period = 2pi
period = –3
period = 3
period = 1/2

Answer 1

The period for a sine function is always 2pi/a where y=sin ax
If y= 3sinx then a=1 so 2pi/1=2pi
2pi =period

Answer 2

Since the argument of the sine function is x without any scaling factor, the period is 2π, the 1st selection.