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2 years ago

Do any of you guys know this please i need helppp!!

Mathematics

2 answers:

Fudgin [204]2 years ago

7 0

The third one
5/6 is the answer

velikii [3]2 years ago

4 0

The answer is 5/6 i have to say it right or a bot deletes my answer

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At a school with 100? students, 33 were taking? Arabic, 32 ?Bulgarian, and 40 Chinese. 9 students take only? Arabic, 12 take onl

Stels [109]

Answer: The answer is 4 and 32.

Step-by-step explanation: Let "A", "B" and "C" represents the set of students who were taking Arabic, Bulgarian and Chinese respectively.

The, according to the given information, we have

$n(A)=33,~~n(B)=32,~~n(C)=40,~~n(A\cap B)=14.$

Let 'p' represents the number of students who take all the three languages, then

$n(A\cap B\cap C)=p.$

Also,

$n(A)-n(A\cap B)-n(A\cap C)+n(A\cap B\cap C)=9\\\\\Rightarrow n(A\cap B)+n(A\cap C)=24+p~~~~~~~~~~~~~~(a),\\\\n(A\cap B)+n(B\cap C)=20+p~~~~~~~~~~~~~~(b),\\\\n(B\cap C)+n(A\cap C)=20+p~~~~~~~~~~~~~~~(c).$

From here, we get after subtracting equation(c) from (b) that

$n(A\cap B)=n(A\cap C)=14.$

Therefore,

$p=14+14-24=4,$ and from equation (a), we find

$n(B\cap C)=24-14=10.$

Thus,

$n(A\cap B\cap C)=4$ and

$n(A\cup B\cup C)=n(A)+n(B)+n(C)-n(A\cap B)-n(B\cap C)-n(A\cap C)+n(A\cap B\cap C)\\\\\Rightarrow n(A\cap B\cap C)=33+32+40-9-12-20+4\\\\\Rightarrow n(A\cap B\cap C)=68.$

Thus, the number of students who take all the three languages is 4 and the number of students who take none of the languages is 100-68 = 32.

5 0

3 years ago

If f(x)= -3x + 1, then f^-1(x)=

UNO [17]

Answer:

f^-1(x) = (x-1)/-3

Step-by-step explanation:

Invert equation:

Describe X in original function:

multiplied by -3

add 1

Reverse order:

subtract 1

divide by -3

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2 years ago

Y=-4x-7 in standard form

Lapatulllka [165]

<span>Y=-4x-7 in standard form is,</span> y + 4 * x + 7 = 0

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3 years ago

A health club charges a $130 yearly membership fee and $3 for each day a member uses the health facilities. If the member paid $

Blizzard [7]

This is the answer for your question: y=3x+130

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3 years ago

PLEASE HELP WITH MARK BRAINLIEST!<br> What is the value of g?

Sati [7]

Answer:

Step-by-step explanation:

this is a right triangle g+55 is a right triangle as shown by the red square in the corner.

90-55=35

so g=35

6 0

2 years ago

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