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1 year ago

Please help me I have no idea what I am doing so could u please help me with this it’s from Khan academy

Mathematics

2 answers:

Elena L [17]1 year ago

4 0

Answer:

The answer is switch direction

Step-by-step explanation:

since the arrow is pointing to the left: <--------

and you don't change the symbol, because when it is greater than or equal to or less than or equal to, it's always a closed circle

Natasha2012 [34]1 year ago

3 0

Answer:

k12

Step-by-step explanation:

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If 40% of a given number is 8, then what is 15% of the given number?

Norma-Jean [14]

40% of a given number is 8...
0.40x = 8
x = 8 / 0.40
x = 20....so 20 is the given number

what is 15% of 20...
0.15(20) = 3 <==== ur answer

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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.

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3 years ago

What is 3 multiplied by 1 8/11 as a mixed number or fraction

maks197457 [2]

Answer:

5 2/11

Step-by-step explanation:

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3 years ago

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Hi! I need to get this answered right away asap! <br>Waht is 4500, divided by 23400?

ANEK [815]

According to a calculator, this is the answer: 0.1923076923. Hope this helped?

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2 years ago

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This is for my sister she need help ASAP

lisov135 [29]

Answer:

Your Answer is C

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2 years ago