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3 years ago

1 times a number is 10 less than 2 times the number

Mathematics

1 answer:

sweet-ann [11.9K]3 years ago

6 0

Use x to represent “a number”
1x=10-2x

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What is 258.42 rounded to the nearest whole number

kicyunya [14]

Answer:

258

Step-by-step explanation:

Check the tenth place. It is 4 which is < 5. So, ignore and write the whole number as it is

So, 258.42 = 258

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3 years ago

Which expression can be used to find the number of liters in 15 quarts?

TiliK225 [7]

<span>15 quarts/1 x 0.95 liter/1 quart</span>

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3 years ago

A pool has 3,500 gallons of water in it. it is draining at a rate of 30 gallons per minute and is now left with 25 gallons. how

eduard

Answer:

this is garbage you will never use

Step-by-step explanation:

#fuuuuuckmath

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3 years ago

Is the answer 35 a5 b5 c5

Serga [27]

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3 years ago

4 men and 6 women are ranked according to their scores on an exam. Assume that no two scores are alike, and that all 10! 10 ! po

anygoal [31]

Answer:

a) $P(X=2)=\frac{2}{15}$

b) $P(X=3)=\frac{1}{30}$

c) P(X=6)=0

d) P(X=9)=0

Step-by-step explanation:

We know that are 4 men and 6 women are ranked according to their scores on an exam. X = 1 indicates that a man achieved the highest score on the exam.

a) We calculate P(X=2).

We calculate the number of possible combinations

$C^{10}_{2}=\frac{10!}{2! (10-2)!}=\frac{10\cdot 9\cdot 8!}{2\cdot 1 \cdot 8!}=45$

We calculate the number of favorable combinations

$C_2^4=\frac{4!}{2!(4-2)!}=6$

We get that is

$\boxed{P(X=2)=\frac{6}{45}=\frac{2}{15}}$

b) We calculate P(X=3).

We calculate the number of possible combinations

$C^{10}_{3}=\frac{10!}{3! (10-3)!}=\frac{10\cdot 9\cdot 8\cdot 7!}{3\cdot2\cdot 1 \cdot 7!}=120$

We calculate the number of favorable combinations

$C_3^4=\frac{4!}{3!(4-3)!}=4$

We get that is

$\boxed{P(X=3)=\frac{4}{120}=\frac{1}{30}}$

c) We calculate P(X=6). This case is not possible because 6 men cannot be selected because we have been given 4 men.

We conclude P(X=6)=0.

d) We calculate P(X=9). This case is not possible because 9 men cannot be selected because we have been given 4 men.

We conclude P(X=9)=0.

5 0

3 years ago