Im confused with these 3 and tell me how u got it

5(-9w) put expression in distributive property

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

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