Giving 40 points and brainliest to the best correct answer, please explain it & thanks. Question in photo:

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

Akid's pool is cylindrical and has a radius of 5 feet and a height of 2 feet. if a cubic foot holds about 7.48 gallons of water, how many gallons of water does the kid's pool hold? 21 gallons 52.3 gallons 1,174,4 gallons 157 gallons