exam Maths Puzzle Numerical Ability

I need someones help desperately. I need to create an equation or inequality that could be used for analysis, prediction or decision making.

I have chosen to create an equation

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exam Other Question

a track is in the shape of a rectangle and two semicircles . the ractangle is 4 yards by 10 yards to the nearest yard what is the perimeter if the track Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?