exam Maths Puzzle Numerical Ability

Determine the domain and range of the function f(x) = 3 - x^2.

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Here is the problem:

Superman takes off after Lex Luthor, who is 125 miles away. Flying to capture Lex takes superman 210 seconds with the tailwind. The return trip takes 215 se 1/9 + 1/3 + 1/4