emily looked at the prices of the fancy pens and quickly estimated (to the nearest dollar) the cost of a typical fancy pen. the prices were $2.42, $2.34, and $6.51. what is the cost of a typical fancy pen, and how did she do it?

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