Your answer is C.
Round all the numbers then multiply since it says estimate.
Π = 3.14 = 3
3.75 = 4
6.21 = 6
3•4^²•6 = 288
The half of 3/4 is 0.375, or 3/8. All you have to do is multiply 3/4 times 1/2.
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Step-by-step explanation: