exam Maths Puzzle Numerical Ability

Can you help me solve this, I need to graph it? f(x) =2/5x

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exam Other Question

Please help; the directions are to verify the identity or something. You will know if your final answers are correct because you should end with the same expression on each side of PPS

48: A parallelogram of area 78 square units has one side of length 12. Find the length of an altitude to that side.