book Maths Puzzle Numerical Ability

How did you find the area of a triangle?

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book Other Question

a/x -3a to the second y to the zero x to the negative one/a = 4x to the negative 1/aa to the negative 1 Two planes leave Chicago-one traveling due east and the other due west. The first travels 100 miles per hour faster than the second. How long will it be until they are 2000 miles apart?