Book Maths Puzzle Area and Volume

If the area of a triangle is 125 m. and the base width equals 25 m. What is the height of the triangle.

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Book Other Question

A mixture of 10% disinfectant is to be made from 14% and 9% disinfectant solutions,how much of each solution should be used if 50 gallons of 10% solution are needed I am having problems with the quadratic formula. My problem is -x^2-3x+5=0 The solution I came out with does not look correct. Please help!