exam Maths Puzzle Numerical Ability

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?

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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= A KELLY BOUGHT 2 TACOS AND 3 ENCHILLADAS. FRED BOUGHT 3 TACOS AND 5 ENCHILLADAS. ONE BILL IS $7.80 THE OTHER IS $12.70. HOW MUCH WAS EACH TACO AND ECHILLADA ?