2x< 8= ? also, can you explain to  me how i can solve these kinds of problems?

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Explain how you can use the associative property to evaluate (7x50)x4.

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?