exam Maths Puzzle Numerical Ability

If x = -2, evaluate -4x-2

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exam Other Question

Draw a graph of y=2x for x-values from 0 to 5 (< x > 5)
could you please explain how to get the answer so I can continue with the rest of the page a rectangular solid with a length 8 and width 2 has volume 48. find its height.