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subtract with or without regrouping...which number can you subtract from 17 w/ or w/out needing to regropu?For which numbers would you need to regroup?

does anybody know the 8th one?

fine its here r^3=3*(C1)^2/(4*pi*density*C_2*g) solve by putting the values given and then, TAKE THE CUBE ROOT OF THE VALUE YOU OBTAINED. ***the end***

A spring of negligible mass, spring constant k = 81 N/m, and natural length l = 1.5 m is hanging vertically. This is shown in the left figure below where the spring is neither stretched nor compressed. In the central figure, a block of mass M = 1 kg is at...