exam Maths Puzzle Numerical Ability

I think this problem has to do with graphs, its a string problem.
A string is stretched from corner to corner on a floor tiled with square tiles. If the floor is 28 tiles long and 35 tiles wide, over how many tiles does the string cover?

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exam Other Question

A circle in the standard (x,y) coordinate plane is tangent to they-axis at 9. What is the equation of the circle in standard form? Hi I need to simplify the following could you please help me. thank you so much, I appreciate your assistance.

6. Simplify: 8 � {3x + 9y � (2x � y) + 8x + 5y}