Rotation 180 degrees about the origin

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

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

How do i solve uniform motion problems?