Ron buys 5 pounds of apples for $3.25. write a direct variation equation for the cost of y of x pounds of apples. find the cost of 21 pounds of apples.

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