exam Maths Puzzle Numerical Ability

Given f(x) = -xTO THE POWER OF 3 - 3x TO THE POWER OF 2 - x + 5, find f(-2), f(0), and f(2)

Given f(x) = xTO THE POWER OF 2 - x + 2, find f(0).

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SAT scores have a mean of 1026 and a standard deviation of 209. ACT scores have a mean of 20.8 and a standard deviation of 4.8. A student takes both test and scores 1130 on the SAT and 25 on the ACT. Compare the scores. How many gallons of a 20% ammonia solution must be mixed with a 5% ammonia solution to create 20 gallons of 11% ammonia solution?