# Math Help - Sinusoidal Functions

1. ## Sinusoidal Functions

Hi i need help with this problem my test is tomorrow and i am trying to figure out if i am right i have attached the file and the problem is number 13

i got y=-1+8cos pi/35(x-5)

$y = ({8})( {cos\frac{\pi(x-5)}{\35})} -1$