## sara1234 3 years ago explain how to Find the amplitude of y = 3 sin x.

1. surdawi

y = A * sin(bx) A = amplitude what is it?

2. sara1234

3

3. surdawi

you got it see how easy it was

4. sara1234

Describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x). f(x) = 9 cos x; g(x) = cos x

5. surdawi

what do you multiply g(x) to get f(x)?

6. sara1234

9

7. sara1234

A.Horizontal stretch by a factor of 9 B.Vertical stretch by a factor of 9 C.Horizontal shrink by a factor of 1over9 D.Vertical shrink by a factor of 1over9

8. surdawi

B.Vertical stretch by a factor of 9

9. surdawi

you can graph them and see the change

10. sara1234

how do you graph y=2/3sin1/2x

11. surdawi

2/3 is the amplitude correct? plug in values for x y=2/3sin1/2x x=0; y = 0 can you try it then i will go over it with you

12. sara1234

this is a differnt question it says find thet graph that goes with y= 2 --- sin 1 3 ---- 2 x

13. surdawi

is that the question?$\frac{ 2 }{ 3 }*\sin(\frac{ 1 }{ 2x })$

14. surdawi

sara you there?

15. sara1234

its not 2x its 1/2 x

16. sara1234

1 --- x 2

17. surdawi

ok amplitude is 2/3 period is $0 \le x \le \frac{ 2*\Pi }{ 1/2 }$

18. sara1234

19. sara1234

20. surdawi

plug in 0 what do you get $\frac{ 2 }{ 3 }*\sin{\frac{ 1 }{ 2 }*0}$

21. surdawi

+ you have the amplitude; which graph shows the right amp?

22. sara1234

how do i know which graph shows 2/3

23. surdawi

all graphs has marked where 1 is