exam Maths Puzzle Numerical Ability

If f(x) = x + 2/3, then the value of f(0) equals.

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exam Other Question

This is supposed to be an rational expression.

The volume of the box is represented by (x^2+5x+6)(x+5). Find the polynomial that represents the area of the bottom of the box. How do I simplify radical expression assuming that all variable under radicals represent positive numbers?