Janie charges $8 an hour to babysit with an additional flat fee of $15 for each babysitting job. She wants to purchase a new game system that will cost her $139.40

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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