Add a very plan a milk tank and be filled in 8 hours using the end belt using the out valve the tank can be emptied in 12 hours. if both valves are open how long will it take to fill the tank?

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step-by-step explanation:

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step-by-step explanation:

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i think it would be c

mark brainliest if im right

step-by-step explanation:

answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.