Aparabolic 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.
4.417 inches
5.252 inches
7.428 inches
20.505 inches

Option (C)

The radius to the nearest thousandth of an inch is 7.428 inches

Explanation:

Given the equation is D(r) =

Where D is the depth and r is the radius

Putting D = 8 inches in the equation

8 =

=

= 55.2

r = 7.428 inches

The radius of depth is 7.428 inches

x/3-10=8

x/3=18

x=48

1; 35 is the ratio

step-by-step explanation: