book Maths Puzzle Numerical Ability

The Pythagoean theorem is so complicated! How do you solve a=5,b=12, and c=?

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book Other Question

The ratio of spaniels to poodles at teh dog show was 5 to 7. If there were 35 spaniels at the dog show, how many poodles werw there?(Use a ratio box) P.S. thank you for the help. How would you write the equation A=1/2b^2-b in factored form?