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After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches) will it reach after its fourth bounce?
I don't know
If after each bounce it reaches
2/5 of the previous height, then after the second bounce it will reach 2/5 x
125. After the third it will reach 2/5 x 2/5 x 125. After the fourth it will
reach 2/5 x 2/5 x 2/5 x 125. This cancels down to 2 x 2 x 2 = 8