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irinina [24]
3 years ago
13

8 ÷ 3/5 Equals? I need this quickly.

Mathematics
1 answer:
cricket20 [7]3 years ago
6 0

Answer:

= 40/3    =  13  1/3  

Step-by-step explanation:

8/1 ÷ 3/5     =   8/1 x 5/3

                         8 x 5 = 40

                          1 x 3 = 3

= 40/3    =  13  1/3

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You are situated 300 feet from the base of Tower Glitz Plaza watching an external elevator descend down the side of the building
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Answer:

18.66 ft/s

Step-by-step explanation:

The distance between you and the elevator is given by:

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The rate of change for the distance between you and the elevator is given by:

\frac{dh}{dt}=\frac{dh}{dy}*\frac{dy}{dt}

-16=\frac{dh}{dy}*\frac{dy}{dt}

\frac{dh}{dy}=\frac{d}{dy} (\sqrt{x^2+y^2})\\

Applying the chain rule:

u=x^2+y^2\\\frac{dh}{dy}=\frac{d\sqrt u}{du} *\frac{du}{dy}\\\frac{dh}{dy}=\frac{1}{2\sqrt u} *2y\\\frac{dh}{dy}=\frac{y}{\sqrt {(x^2+y^2)}}

Therefore, at x=300 and y = 500, dy/dt is:

-16=\frac{y}{\sqrt {(x^2+y^2)}}*\frac{dy}{dt}\\-16=\frac{500}{\sqrt {(300^2+500^2)}}*\frac{dy}{dt}\\\frac{dy}{dt}=-18.66\ ft/s

The elevator is descending at 18.66 ft/s.

7 0
3 years ago
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erastovalidia [21]

Answer:

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3.  Convert mixed number to improper fraction

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