Question

The function ​f(x)​ is the number of feet below the surface of the water a diver is at x seconds. After 14 s, the diver reached the maximum distance of 22 ft below the surface of the water. The diver stayed in the water for 20 minutes.

What is the practical domain for the function f(x)?

[0,1200]

all negative real numbers

all positive real numbers

[−22,0]
x is the time, not the depth. They used x instead of t to confuse you. Negative times are unusual.

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