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makvit [3.9K]
3 years ago
15

About how accurately must the tank's exterior diameter be measured to calculate the amount of paint it will take to paint the si

de of the tank to within 5% of the true amount? Express your answer as a percentage of the outer diameter:
Mathematics
1 answer:
kondaur [170]3 years ago
5 0

Answer: The error of the diameter would be 5% .

Step-by-step explanation:

Since we have given that

S=2\pi rh

Here, r is the radius

h is the height

So, it becomes,

S=2\pi (\dfrac{D}{2})h\\\\S=\pi Dh\\\\S=\pi D\times 10\\\\S=10\pi D

So, we will derivate S wrt D, we get that

\dfrac{dS}{dD}=10\pi\\\\dS=10\pi dD---------------------(1)

As we have given that

it will take to paint the side of the tank to within 5% of the true amount.

So, it becomes,

dS=0.5\pi D ---------------(2)

So, from (1) and (2) , we get that

0.5\pi D=10\pi dD\\\\\dfrac{0.5\pi}{10\pi}=\dfrac{dD}{D}\\\\0.05=\dfrac{dD}{D}=5\%

Hence, the error of the diameter would be 5% .

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Find the value of x and y
Natalija [7]

Hello and Good Morning/Afternoon:

<u>Let's take this problem step-by-step</u>:

<u>What does the information want:</u>

  • value of x
  • value of y

<u>Let's gather some information</u>:

  • ΔA'BC' and ΔABC are similar triangles

             ⇒ Angle B is shared by both triangles

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                   lines, A'C' and AC, and both angles are formed with the

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                 ⇒ by the <em>Angle-Angle Theorem*</em>, they are similar triangles

<u>If they are similar triangles</u>:

   ⇒ their side lengths are proportional to each other

  • let's find x's value

          ⇒ let's set up a proportion

                 \frac{A'B}{AB} =\frac{A'C'}{AC} \\\frac{30}{x+30} =\frac{14}{22} \\14(x+30) = 30*22\\14x + 420 = 660\\14x = 240\\x = 17.143

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<u>Answer:</u>

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#LearnwithBrainly

 

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Answer:

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