exam Maths Puzzle Numerical Ability

One side of a rectangular stage is 2meters longer than the other. If the diagonal is 10 meters, then what are the lengths of the sides?

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exam Other Question

Marla begins waling at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way. The distance to the library is 4 mi. How many hours did marla walk? Can someone please help me. I do not know how to graph an equation like this one.
Graph f(x)=-2x+4