What is 1/4+5/12 simplified

Astudent simplified a rational expression as shown.

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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