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elena-14-01-66 [18.8K]
3 years ago
13

Find the probability of each event.

Mathematics
1 answer:
omeli [17]3 years ago
3 0

Answer:

The probability that cards # 1, # 2, and # 3 are still in order on the top of the stack is 0.045%.

Step-by-step explanation:

Since a politician is about to give a campaign speech and is holding a stack of thirteen cue cards, of which the first 3 are the most important, and just before the speech, she drops all of the cards and picks them up in a random order, to determine what is the probability that cards # 1, # 2, and # 3 are still in order on the top of the stack, the following calculation must be performed:

1/13 x 1/13 x 1/13 = X

0.076 x 0.076 x 0.076 = X

0.00045 = X

0.00045 x 100 = 0.045

Therefore, the probability that cards # 1, # 2, and # 3 are still in order on the top of the stack is 0.045%.

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Step-by-step explanation:

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There are 1,860 steps from the street level to the 102nd floor of the Empire State building. If a person can walk up the stairs
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A company has to buy computers and printers. Each computer, x, costs $585 and each printer, y, costs $385. If the company spends
Luden [163]

The company bought 9 computers and 6 printers

<em><u>Solution:</u></em>

Let "x" be the number of computers bought

Let "y" be the number of printers bought

cost of 1 computer = $ 585

cost of 1 printer = $ 385

<em><u>The company buys a total of 15 machines</u></em>

Therefore, we can frame a equation as:

number of computers bought + number of printers bought = 15

x + y = 15 ------ eqn 1

<em><u>The company spends $7,575</u></em>

Therefore, we can frame a equation as:

number of computers bought x cost of 1 computer + number of printers bought x cost of 1 printer = 7575

x \times 585 + y \times 385 = 7575

585x + 385y = 7575 ------ eqn 1

<em><u>Let us solve eqn 1 and eqn 2</u></em>

From eqn 1,

x = 15 - y --------- eqn 3

<em><u>Substitute eqn 3 in eqn 2</u></em>

585(15 - y) + 385y = 7575

8775 - 585y + 385y = 7575

-200y = 7575 - 8775

-200y = -1200

y = 6

<em><u>Substitute y = 6 in eqn 3</u></em>

x = 15 - 6

x = 9

Thus the company bought 9 computers and 6 printers

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3 years ago
The angle from a stake in the ground to the top of a tree is 60 degrees. If the height of the tree is 40 feet, what is the dista
Nonamiya [84]

Answer:

23.09 ft

Step-by-step explanation:

Here we are given that the angle from stake in ground to the top of the tree is 60° and the height of the tree is 40ft . We are interested in finding out the distance from stake to the bottom of the tree . For figure refer to the attachment .

From the figure , BC = 40ft which is the perpendicular of the right angled triangle ABC . Also assume that AB = x ft , which is the base of the triangle .

Now since we have base and perpendicular , we should use the ratio of tangent as ,

\rm\longrightarrow tan\theta =\dfrac{perpendicular}{base}=\dfrac{p}{b}

And here \theta = 60° . On substituting the respective values , we have ;

\rm\longrightarrow tan 60^o =\dfrac{40\ ft}{x \  }\\

And the value of tan60° = √3 , so that ;

\rm\longrightarrow \sqrt3 =\dfrac{40\ ft}{x}

Cross multiply ,

\rm\longrightarrow x =\dfrac{40}{\sqrt3}ft.

The value of √3 is 1.732 approximately .

\rm\longrightarrow x =\dfrac{40}{1.732}ft.

Simplify,

\rm\longrightarrow \underline{\underline{\red{{x =23.09\ ft }}}}

And we are done !

4 0
3 years ago
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