exam Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.
5x-2y=-5
y-5x=3

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exam Other Question

Please can you help me with this application exercise?

A baseball diamond is actually a square with 90 foot sides.What is the distance from home plate to second base? Find the number of terms and the sum of the series 7+17+27+...+107