book Maths Puzzle Numerical Ability

What is the formula to calculate the length of the diagnal side of a right angle triangle if the other 2 dimensions are known?

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book Other Question

tickets to a junior high school play cost $1.10 for each adult and $0.40 for each child. if 360 tickets were sold for a total of $282.60, how many tickets of each kind were sold? Evaluate this expression:

a/b for a = 2/3 and b = -5/6