exam Maths Puzzle Numerical Ability

Can someone help me with this problem. I noted up above what book and page number the problem is on.

I nned to give the coordinates of the points in that graph on page 519 fo

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What is 10 + 4 (m + 2) simplified? A certain radioactive element decays exponentially with a half-life of 5 hours. Find the time that has elapsed if a 50mg sample has decayed to 17 mg.