A parabolic listening device is shaped such that the depth of the bowl depends on its radius and can be represented by the curve D(r) = 0.145r^2. What is the radius when the depth is 8 inches? Round to the nearest thousandth of an inch.

1) 4.417 inches
2) 5.252 inches
3) 7.428 inches
4) 20.505 inches

4.416 inchs'

Step-by-step explanation:

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b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

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