21 A pump can be set to extract water from a pool at one
of three different rates:1 gallon per minute.
4 gallons per minute, or 8 gallons per minute. The
graph below shows the amount of water left in the
pool from the time the pump was turned on. How
many minutes after being turned on was the pump
switched to a rate of 8 gallons per minute?

neither i nor ii 56 / 4.9 = 11.91489362 and 82 / (11+5) =5.125 so i is wrong

ii. (24/8+2) times 3 = 15 and (42+9)/2 =25.5

step-by-step explanation:

56

a

step-by-step explanation:

the answer is a

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !