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3 years ago

If c not equal be a rational number and d be an irrational number. then c×d is

Mathematics

1 answer:

melamori03 [73]3 years ago

8 0

When you multiply a rational and an rational you always get an irrational. answer 3

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X=?? solve for x hurry!

jarptica [38.1K]

Answer: x + 30 + 90= 180(sum of angles on a straight line)

x= 180-120

x=60

7 0

3 years ago

New York City is the most expensive city in the United States for lodging. The mean hotel room rate is per night (USA Today, Apr

kow [346]

Answer:

$P(X$

Step-by-step explanation:

Assuming a mean of $204 per night and a deviation of $55.

a. What is the probability that a hotel room costs $225 or more per night (to 4 decimals)?

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean"

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Let X the random variable that represent the cost per night at the hotel, and for this case we know the distribution for X is given by:

$X \sim N(204,55)$

Where $\mu=204$ and $\sigma=55$

And let $\bar X$ represent the sample mean, the distribution for the sample mean is given by:

$\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})$

We are interested on this probability

$P(X>225)$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(X>225)=P(\frac{X-\mu}{\sigma}>\frac{225-\mu}{\sigma})$

$=P(Z>\frac{225-204}{55})=P(Z>0.382)$

And we can find this probability on this way:

$P(Z>0.382)=1-P(Z$

8 0

2 years ago

What is the solution of the system of equations shown in the graph ?

Katarina [22]

The answer is (0,-3) and (0-1)

hope this helped

4 0

2 years ago

A jar has 5 red marbles, 3 blue marbles, and 2 green marbles. what is the probability that you would choose a red marble, return

denis23 [38]

Answer:

In Fraction = 10/100 simplified = 1/10

Decimal = 0.1

Percentage = 10%

Step-by-step explanation:

We add all marbles = 5+ 3+ 2 = 10

Event 1 = Red = 5/10

Event 2 = Green = 2/10

We follow this path and multiply = 2 x 5 / 10 x 10 = 10/100 = 1/10

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3 years ago

Explain how to graph the given piecewise-defined function. Be sure to specify the type of endpoint each piece of the function wi

suter [353]

You would graph the equation f(x) = –x + 3 for input values less than 2. There would be an open circle at the point (2, 1) since the domain for the first piece does not include 2. You would then graph a horizontal line at f(x) = 3 for input values between 2 and 4. There would be a closed circle at (2, 3) and an open circle at (4, 3). Last, you would graph f(x) = 4 – 9x for input values greater than or equal to 4. There would be a closed circle at the point (4, –4) since 4 is in the domain of the third piece.

8 0

3 years ago

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