Acoach’s swimming team practices 5 times per week. there are 4 age groups on the team, and each group practices at a different time. each group practices a total of 60 minutes per practice. what is the total amount of time the coach spends at practice during the week?

Well from what I'm reading it could turn out to be

4 being the groups and 60 being the minutes they practiced. 5 being the days the coach had to stay and 60 dividing the sum because there is 60 minutes in an hour. So 4×60×5=1200 and 1200÷60=20. So the coach spent 20 hours at practice during the week.

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240