Hello, I have been needing help for this problem for awhile. Can someone help me please?

What is the rotational symmetry of a wheel

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

Which expression converts 45 degree to radians