2 years ago

Help, show work please

Mathematics

1 answer:

Talja [164]2 years ago

8 0

Answer:

the model has a ratio of 2:5 to the real tower

Step-by-step explanation:

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Y_Kistochka [10]

Answer:

Step-by-step explanation:

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2 years ago

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A train drove the distance of 440 feet in 20 seconds. Select ALL the unit rates that are equivalent to the speed of the model ai

katrin [286]

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3 years ago

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

nordsb [41]

Answer:

18.66 ft/s

Step-by-step explanation:

The distance between you and the elevator is given by:

$h=\sqrt{x^2+y^2}$

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

mary bought a bag of jelly beans there were 24 green ones which made up 8% of all the jelly beans in the bag howmany jelly beans

dimulka [17.4K]

There were 300 jelly beans in the bag. that includes the green ones.

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2 years ago

What is the measure of an angel that turns through 3/4 of a complete circle?

dimulka [17.4K]

2/3 think of this as a pie right divided into 3 area but only 2 people eat from it 1 left but how would i complete it if its not done well i need to complete the "pie"
by adding an exponent into the mesure and cacultating a mass of a=mx+b
now you divide and get 0.75
so you will fill in .25 more to get the full measurement by eating 1 more pie:

6 0

3 years ago

Help, show work please​

Help, show work please