Question

State the amplitude, period, and phase shift of the function y = -0.4 sin (10x+pi/2).

I know the period is pi/5

Answer 1

Amplitude is the quantity in front of the trig

Answer 2

What is the trig again?

Answer 3

like before the "sin"

Answer 4

Correct

Answer 5

All my answer choices are positive 0.4, is there a reason for that?

Answer 6

Because it's always the absolute value

|A|

Answer 7

@sammietaygreen

The attached chart may help.

Answer 8

Ohhh, okay how do I find phase shift? I kinda figured it was 0.4 since that's the only answer choice but I wanted to know how

Answer 9

Phase shift is C/B

And your equation is |A|Sin(B+C)

So you would do (pi/2)/(10x/1)

You could multiply by the reciprocal

Answer 10

Pi. 1
-- times --
2. 10x

Sorry, I'm on a phone typing this

Answer 11

so like pi/20?