exam Maths Puzzle Numerical Ability

Evaluate each function to the value specified
f(x) =x squared - 7x + 10; find (a)f(0), (b)f(5), and (c)f(-2)

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exam Other Question

5x + 3y = 12 If x is 1 then what is y Okay, second time asking for help with this particular question.
2x+1/x^2-16 [+] x^2-6x-7/x^2-11x+28
I placed the + in [] just so you could tell the two fraction apart, it does not mean anything.