What is 1*2*...*99*100

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

To increase her number of students, the instructor put a coupon in the local paper offering to waive the one-time fee for new students. what is the value of the coupon?

Estimate the difference by rounding each number to the nearest half or whole. 8 1/16 - 2 5/8 a) 6 1/2 b) 6 c) 5 d) 5 1/2