1) A bicycle tire with radius 33cm rotates at a rate of 5 revolutions per second. The top of the valve stem is located 7cm above the surface of the road.

a) Draw a graph showing the height of the top valve stem above ground level in terms of time. Assume that the valve stem is initially at its lowest position.(i just need to know where to put some stuff and how to get it)

b) Write the equation of a cosine function that describes the height of the top of the valve stem, y, as a function of the time, x. Use a negative value for A and a phase shift of 0.

c) What is the height of the valve stem above the ground 10.11 seconds after it is at its lowest point?