Easy question i guess? Which of the following two-dimensional shapes can be rotated to create a sphere?

A. Triangle
B. Square
C. Circle
D. Ellipse

please give an explanation and not just a letter or answer. Thank you

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18

100 points? me its important ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️