Aposter is shown below: what are the dimensions if the poster enlarged by a factor of 7/2 6 in height 18 in length a: 42 in by 126 in b: 3 in by 9 in c: 9 in by 12 in d: 21 in by 63 in

Which one ? is the answer and how to find this answer

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

What is the length of the segment, endpoints of which are intersections of parabolas y=x2? 11 4 x? 7 4 and y=? 7 8 x2+x+ 31 8 ?