Henry made himself a sandwich that was 11 Over 12 of a foot long. He put pepperoni on Three-fourths of his sandwich. What length of the sandwich did not have pepperoni on it?

Can someone me and do the problem plz so i can understand it more better

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

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?