What is the height of a square pyramid with a volume of 75 cubic feet and base length of 5 feet

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

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Write the equation in logarithmic form m^x=n