exam Maths Puzzle Numerical Ability

Every machine that inputs numbers and outputs numbers is a function
True
False

The machine that multiplies an integer by 7 and then subtracts 1/2 from the result is a funct

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exam Other Question
F(X)=-4.2X4+6 which number is a possible solution to this equation 2x^3-4x^2+5x-14=0.
2, 3, 5, or 0