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babymother [125]
4 years ago
11

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.

Mathematics
2 answers:
faltersainse [42]4 years ago
7 0

Answer:

\large \boxed{\text{7.428 in}}

Step-by-step explanation:

\begin{array}{rcl}D & = & 0.145 r^{2}\\8 & = & 0.145 r^{2}\\55.17 & = & r^{2}\\r & = & \sqrt{55.17}\\& = & \textbf{7.428 in}\\\end{array}\\\text{The radius is $\large \boxed{\textbf{7.428 in}}$ when the depth is 8 in.}

The graph shows the profile of your parabolic listening device,

KatRina [158]4 years ago
4 0

The answer is c on edg

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The basketball fell at rate of 9.8 feet per second

Step-by-step explanation:

The rate is the distance per unit time

Here

Given

Distance = height = h = 53.9 feet

time = t = 5.5 sec

The rate will be given as:

Rate = \frac{Height}{time} = \frac{h}{t}\\= \frac{53.9}{5.5}\\= 1.78\\

Hence,

The basketball fell at rate of 9.8 feet per second

Keywords: Division, decimals

Learn more about division at:

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3 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
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Answer:

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Step-by-step explanation:

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6 0
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Answer:

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Step-by-step explanation:

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Given that :

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