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Kobotan [32]
3 years ago
13

Here's a subtraction problem that has been solved incorrectly.

Mathematics
1 answer:
fredd [130]3 years ago
5 0

Answer:You’re answer would have to be B) 41+28=69

Because 69-28=41 and 41+ 28 = 69

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Write a proportion to answer the question.
goblinko [34]

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An oil tank is leaking into a lake at a rate of 0.1 m3/day. The oil slick forms a semicircular disk whose center is at the leak
gregori [183]

Answer:

17.9  m/s

Step-by-step explanation:

Volume of the slick =  0.5 x π r² h--------------------------------- (1)

Where r = radius of slick

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V  =  0.5 x π r² h

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r =     10³/√π

dV/dt =   πrh dr/dt  + 0.5π r² dh/dt----------------------------------- (2)

Asumming the film thickness is constant , equation (2) becomes

dV/dt =   πrh dr/dt-------------------------------- (3)

dV/dt = 0.1m³/day

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dr/dt= rate of expansion of the slick

Substituting  into (3);

0.1 =  π x 10³/√π x 10⁻⁶ x dr/dt

dr/dt = 0.1  x 10⁶/ ( π x 10³/√π)

       =  17.9479 m/s

       ≅  17.9  m/s

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3 years ago
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Answer:

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Step-by-step explanation:

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7 0
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AnnyKZ [126]

Answer:

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Step-by-step explanation:

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3 years ago
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