book Maths Puzzle Numerical Ability

Find the radius of an inscribed circle in a triangle with legs 12, 12, 8.

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book Other Question

I am not sure what to do.

(a) What is the sum of the roots of the equation ax squared + bX + c = 0
(b) What is the product of its roots? Graph the following

3x - 4y is less than or equal to 12

Thank you!