exam Maths Puzzle Numerical Ability

5x + 3y = 12 If x is 1 then what is y

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exam Other Question

multiply n^2-n-20/2n^2 multiplied by n^2+5n/n^2-25

My answer is n-4/2n Am I right? Please help, Thanks
Evaluate each function to the value specified
f(x) =x squared - 7x + 10; find (a)f(0), (b)f(5), and (c)f(-2)