Is there any positive number bb so that the expression logb(0) makes sense? explain how you know

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

Can someone tell me if this is perpendicular? !

Factor the polynomial expression x6 – x3 – 20