Answer:
2 10/27 ft . . . . or . . . . 2 feet 4 4/9 inches
Step-by-step explanation:
The height on the first bounce is ...
... (12 ft) × 2/3 = 8 ft
The height on the second bounce is ...
... (8 ft) × 2/3 = 16/3 ft
The height on the third bounce is ...
... (16/3 ft) × 2/3 = 32/9 ft
The height on the fourth bounce is ...
... (32/9 ft) × 2/3 = 64/27 ft = 2 10/27 ft
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Conversion of fractional feet to inches
10/27 ft = (12 in/ft) × (10/27 ft) = 40/9 in = 4 4/9 in
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Explicit formula
We can see that for each bounce (including the first), we multiply the initial height by 2/3. After n bounces, we have multiplied the initial height by (2/3)^n. Thus the height after n bounces will be ...
... h(n) = (12 ft)×(2/3)^n
For the 4th bounce, this is ...
... h(4) = (12 ft)×(2/3)^4 = (12 ft)×(16/81) = 64/27 ft
