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3 years ago

9

For each of these intervals, list all its elements or explain 2.1 Sets 131 why it is empty. a) [a,a] c) (a, a] e) (a,b), where a

> b b) [a,a) d) (a, a) f) [a,b],wherea>b

1 answer:

stepan [7]3 years ago

6 0

Answer: b

Step-by-step explanation:

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Find two numbers with a sum of 20 and a difference of 14.

vivado [14]

A and B Definitely. 3 and 17, -3 and -17

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2 years ago

Pls I need help with this question..Thanks

Nimfa-mama [501]

Answer:

60cm

Step-by-step explanation:

1:50 means every foot is 50 feet.

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2 years ago

In the following expression which terms can be combined?

joja [24]

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2 years ago

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

Tell me the answer on this to lazy at least am honest

luda_lava [24]

Answer:

reflection

Step-by-step explanation:

it goes against the y axis

3 0

2 years ago

Read 2 more answers