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Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

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