How do i solve 15+5-5/12. give me the steps

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

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters

When steve woke up. his temperature was 102 degrees f. two hours later it was 3 degrees lower. what was his temperature then?