The amplitude of y=-3sinx is a. -3 b. -1 c. 3 d. 1/3

C. 3.

Step-by-step explanation:

We are given that

We have to find the amplitude of y =-3sinx

Amplitude:The absolute value of   maximum displacement from a zero value during one period of oscillation.

Or

Amplitude: It can be maximum displacement from the mean position of any crest of trough .

If we have a function

Then the amplitude is" a".

We have  a function

Then amplitude is "3"

By comparing with the given function

Where negative sign represents the displacement in opposite direction.We can say that the displacement from mean position of trough  is 3.Amplitude is define as the peak value of crest or trough.

Amplitude is a value of displacement therefor, it always a positive value not negative.

Hence, the option is C is true.

hi,

you half the rectangle that you ae asking about so then you would see the scale factor of 1/2 the one u have selected, the one on top is half.

hope this !