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melisa1 [442]
3 years ago
7

0.2) 15.6 ОА. 0.78 ОВ. 7.8 Ос. 78 OD. 780

Mathematics
2 answers:
LiRa [457]3 years ago
5 0

Answer:

If you're looking for what half of 15.6 is, it's 7.8

Step-by-step explanation:

Dafna1 [17]3 years ago
3 0

Answer:

b i take the test

Step-by-step explanation:

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A trough is 9 feet long, and its cross section is in the shape of an isosceles right triangle with hypotenuse 2 feet, as shown a
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Answer:

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Step-by-step explanation:

Given:

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=> The volume of the trough: V =\frac{9}{2} * (b * h) (1)

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=> the other two sides of the triangle is:

= tan(45 degrees) = h/(b/2)

<=> b = 2h   substitute in (1), we have:

V = \frac{9}{2}  *(2h *h) = 9h^{2}  

Take derivative of volume with respect to time to find equation for rate of filling the trough

dV/dt = 2 * 9 *h dh/dt = 18h dh/dt

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<=> V = t * rate = 2 * 2 = 4

But V = 9h^{2}    

<=> 9h^{2}     = 4

<=> h = 2/3  

The rate is the height h feet of the water in the trough changing 2 minutes after the water begins to flow:

dh/dt = 1/(9h) = 1/(9 * 2/3) = 1/6

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