21 is bigger than or equal to 5 - 2x, what is the value of x in the following inequality

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Acylinder has volume 45π and radius 3. what is it’s height?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?