exam Maths Puzzle Numerical Ability

I am really confused with this homework problem.

I have two triangles that are congruent. The first triangle's measures are the sides of AB=13, AC=x(unknown), and the base BC=

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exam Other Question
3(x+1)<18 graph the circle whose equation is x squared + y squared = 64. what is its radius? what do the equatons x squared + y squared = 1 and x squared + y squared = k all have in common? how do they differ?