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

I know the period is pi/5

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

fortytherapper · Answer

Amplitude is the quantity in front of the trig

sammietaygreen · Answer

What is the trig again?

sammietaygreen · Answer

like before the "sin"

fortytherapper · Answer

Correct

sammietaygreen · Answer

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

fortytherapper · Answer

Because it's always the absolute value

|A|

directrix · Answer

@sammietaygreen 

The attached chart may help.

sammietaygreen · Answer

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

fortytherapper · Answer

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

fortytherapper · Answer

Pi.          1
--  times --
2.            10x

Sorry, I'm on a phone typing this

sammietaygreen · Answer

so like pi/20?