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) = 0.145r2. What is the radius when the depth is 8 inches? Round to the nearest thousandth of an inch
1 answer:
The correct answer: 7.428 inches
Explanation:
Given the equation is D(r) = 0.145r^2
Where D is the depth and r is the radius
Putting D = 8 inches in the equation
8 = 55.2
r^2= 8/ 0.145
r^2 = 55.2
R^2= 7.428 inches
The radius of depth is 7.428 inche
Hope this help you : )
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