exam Maths Puzzle Numerical Ability

3-5x�=-9

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s=0.5(70-25)40=
can u solve this for me and explain it please A 20 foot tall telephone pole is at a right angle with the ground. A 25 foot wire is to be attached from the top of the pole to a point on the ground so the wire is taught. How far from the base of the pole would the wire be attached?

Thanks~