book Maths Puzzle Numerical Ability

How would you translate phrases into algerbraic expressions?
Example: twice a number

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book Other Question

How do I simplify and divide teh square root of 7 over the square root of 8? h(x) = 19; find h (4), h(-6), and h(12).

P(x) = 3x^2 - 2x + 5; find P(0),P(-2), and P(3).