3 years ago

0.02 is 10 times 0.2

Mathematics

1 answer:

atroni [7]3 years ago

6 0

Yes that answer is correct

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The roots of the equation 2x^2+8x-7=-2 are?

olchik [2.2K]

<span>2x^2+8x-7=-2
</span><span>2x^2+8x - 5 = 0

using the formula:- x = [-8 +/- sqrt(8^2 - 4*2*-5) ] / 4
= -2 +/- sqrt 104)/2
= 0.5495 , -4.549
</span>

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3 years ago

3 3/8 + 1 1/4 help meeeee pleaseee

Amanda [17]

Answer:

37/8 (fraction) or 4.625 (decimal) or 4 5/8 (mixed number)

Step-by-step explanation:

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The rate of change of the volume of a snowball that is melting is proportional to the surface area of the snowball. Suppose the

Alisiya [41]

Answer:

According to the passage, we have the next equation:

$\frac{dV}{dt} = \frac{4}{3}\pi*3*r^{2}*\frac{dr}{dt} = K*(4\pi*r^{2} )$

where "K" is a proportional constant

Leaving at the end with the next equation:

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Integrating the equation, we have:

$r=K*t+C$

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Then, we have the 2 conditions for the problem:

1) t=0 → r=10

Replacing in the equation, we have C = 10

2) t=5 → r=8

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Finally, the time which the snowball will be completely melted will be when r = 0. So replacing in the equation

$0=-0.4*t+10$

t = 25 minutes

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The height will be 14.4

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