book Maths Puzzle Numerical Ability

Solve the following inequality--
2x + 8<= -16 + 8x
thanks in advance

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book Other Question

Suppose that as you throw the rock you give it a forward motion of 20 feet per second. the rock will hit the the ground __ feet away from you. Measured horizontally. can you plz give me an example of a quadratic equation that can be applied in real life problems?