What is 12 times i know it but its for a friend

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

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?