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2 years ago

I need a lot of help please! Giving out lots of points!

Mathematics

2 answers:

Rina8888 [55]2 years ago

7 0

1st question is 2

Hope it helps :D

DerKrebs [107]2 years ago

7 0

Jere is my answer :) i posted in the comments above

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Seven people are in an elevator which stops at ten floors. In how many ways can they get off the elevator?

zlopas [31]

The number of ways people can get off the elevator is 604800 ways.

In this question,

Number of people, n = 7

Number of floors, r = 10

The first person can leave elevator in one of 10 ways. Then second person has to choose from one of remaining 9 floors. Then third person in 8, fourth in 7 ways and so on.

Number of ways people can get off the elevator can be calculated as

⇒ $nP_r=\frac{n!}{(n-r)!}$

⇒ $10P_{7}=\frac{10!}{(10-7)!}$

⇒ $10P_{7}=\frac{10!}{(3)!}$

⇒ $10P_{7}=\frac{(10)(9)(8)(7)(6)(5)(4)3!}{(3)!}$

⇒ $10P_{7}=(10)(9)(8)(7)(6)(5)(4)$

⇒ 604800 ways.

Hence we can conclude that the number of ways people can get off the elevator is 604800 ways.

Learn more about number of ways here

brainly.com/question/27992615

#SPJ4

4 0

1 year ago

Find the missing part.

sveta [45]

Answer:

The answer is $a = \frac{15}{4}$

Step-by-step explanation:

We have to:

$cos(\theta) = \frac{adjacent\ side}{hypotenuse}$

So, if we take the 60 degree angle of the smallest triangle, we have to:

$cos(60) = \frac{a}{x}$

We do not know x. But if we take the sine of the angle of 30 degrees and the main triangle we have:

$sin(30) = \frac{x}{15}\\\\x =\frac{15}{2}$

Then:

$cos(60) = \frac{a}{\frac{15}{2}}$

$a = cos(60)\frac{15}{2}$

$a = \frac{15}{4}$

7 0

2 years ago

4/7<br> of a number is 36<br> What is the number?

katrin [286]

$\text{If the number is x,}\\\\~~~~~\dfrac 47 \cdot x =36\\\\\implies 4x = 36 \times 7\\\\\implies x =\dfrac{36 \times 7}4\\ \\\implies x = 9 \times 7\\\\\implies x = 63\\\\\text{Hence, the number is 63.}$