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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an outboard motor calls for a fuel mixture of gasoline and oil to be 50 to 1. That is, 50 parts of gasoline to 1 part of oil. How many pints of oil should be added to 6 gallons of gasoline? how do i simplify the following; 2x^6 -6x^4 +4x^3 / 2x^5