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3 years ago

The expression 7! is equal to which of the following

Mathematics

2 answers:

Sladkaya [172]3 years ago

8 0

Its basically 7 see there is nothing but the number 7 which means as to an expression its 7.

Allushta [10]3 years ago

7 0

...a...a is the same number....7....

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A particle moves on the hyperbola xy=18 for time t≥0 seconds. At a certain instant, y=6 and dydt=8. What is x that this instant?

professor190 [17]

Answer:

The value of x at this instant is 3.

Step-by-step explanation:

Let $x\cdot y = 18$ , we get an additional equation by implicit differentiation:

$x\cdot \frac{dy}{dt}+y\cdot \frac{dx}{dt} = 0$ (1)

From the first equation we find that:

$x = \frac{18}{y}$ (2)

By applying (2) in (1), we get the resulting expression:

$\frac{18}{y}\cdot \frac{dy}{dt}+y\cdot \frac{dx}{dt} = 0$ (3)

$y\cdot \frac{dx}{dt}=-\frac{18}{y}\cdot \frac{dy}{dt}$

$\frac{dx}{dt} = -\frac{18}{y^{2}} \cdot \frac{dy}{dt}$

If we know that $y = 6$ and $\frac{dy}{dt} = 8$ , then the first derivative of x in time is:

$\frac{dx}{dt} = -\frac{18}{6^{2}} \cdot (8)$

$\frac{dx}{dt} = -4$

From (1) we determine the value of x at this instant:

$x\cdot \frac{dy}{dt} = -y\cdot \frac{dx}{dt}$

$x = -y\cdot \left(\frac{\frac{dx}{dt} }{\frac{dy}{dt} } \right)$

$x = -6\cdot \left(\frac{-4}{8} \right)$

$x = 3$

The value of x at this instant is 3.

4 0

2 years ago

Which image shows a reflection of the figure below?

uysha [10]

The answer is the third image.

It shows the original image reflected across the y-axis.

Hope this helps! :)

8 0

3 years ago

Read 2 more answers

I'LL GIVE BRAINLIEST ANSWER TO CORRECT ANSWER

inn [45]

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3 years ago

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damaskus [11]

Answer:

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Step-by-step explanation:

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H is the x coordinate and K is the y coordinate

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Ainat [17]

Answer:

I think C

Step-by-step explanation:

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2 years ago