A is done please help with the rest!!

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

Can someone me and do the problem plz so i can understand it more better

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5