exam Maths Puzzle Numerical Ability

If the sum of a number and -3 is doubled the result is 1/2 times the number. Find the number.

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exam Other Question

1/X + X/3X+9 - 3/X^2+2X Can someone help me on this problem?

I need to evaluate the function on this problem for the value specified.

f(x) = x^2 - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2).

Thanks so much,
Sher