exam Maths Puzzle Numerical Ability

Solve for "r"

C=2(Pi)r

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exam Other Question

Please find:

the distance (-2,3,1) and (4,5,-1)

and

midpoint (-2,3,1) and (4,5,-1)

Thanks If three times the first number plus four times the second number equals 26, and ten times the first number and minus two times the second number equals 10, what are the numbers?