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Maths Puzzle
Numerical Ability
the radius r of a sphere is increasing at a rate of 2 inches per minute. find the rate of change of the volume when r=6 inches and dr/dt=24 inches.
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On a string of pearls, the middle pearl is the largest and most expensive of all. Starting from one end, each pearl is worth $100.00 more that the one before it up until the middle
find the midpoint and length (to the nearest hundredreth) of the line segment between the points P sub 1 (4,6) and P sub 2 (-2, 1)