Please help! I need to find the equation for each of these....I do not understand how to do so...please help...

The Amplitude on 67 looks like it is 3...

How do I solve for the period...If I know that, then I can put it in the equation...

On 68, the amplitude is 2

And 70 also appears to be 2

http://i103.photobucket.com/albums/m...91919/11-1.jpg