You can run it through Excel or a lot of calculators and they'll do sine regressions. I used my ol' TI-92 and got:
For the second part of the problem, set the equation equal to 0.5 and solve for x.
Here is a picture of my question, just click on it to enlarge it. I need the equation to be sin. Here is an example from another question of the format of the formula.
And here is the question
This is extremely urgent, please help out.
Are you sure you're not in degrees. When I use .5, I get .439
.45 is what is in the chart. That is very close. Looking again, I do not see anything wrong. The data matches very close.
Using my equation we get
0 is -.003
.5 is .44
.75 is .61
1.25 is .83
2.25 is .61
3 is -.003
I do not know how you got -21 for x=.5
Those look close to me.
I suppose I am misunderstanding.
If you have something like , then the period is and the phase shift is . The amplitude is |a|