exam Maths Puzzle Numerical Ability

Please find:

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

and

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

Thanks

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exam Other Question

13-2/5 = H + 6-4/15
My daughter has just begun to take Pre-Alegbra & we are seeking help in learning the proper to understand equations. Thanks! Solve for "r"

C=2(Pi)r