exam Maths Puzzle Numerical Ability

what is the smallest positive integer for n in which the cubic root of 3600n is a rational number

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exam Other Question

I'm trying to solve the equation of a circle with the following vertics. (0,0), (20,0) and (0,21).

It appears to me that there is no solution. If you plot the points on a graph Please can you help me? Amanda has 500 in ten dollar, five dollar, and one dollar bills. There were 100 bills in all, and 20 more five dollar bills than ten dollars bills. How many one-dollar bills did Amanda have? Round to nearest whole number