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2 years ago

Geometry 3.2 quiz Version A

Mathematics

1 answer:

nasty-shy [4]2 years ago

7 0

Answer:

Just google "fixcron dark ocb" and thank me later

Step-by-step explanation:

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1, In a class of 80 students in Debreberhan University, 45 are good in mathematics, 15 are good in both mathematics and in Engli

Aleks [24]

Treating the data as a Venn set, it is found that:

26 students are good in mathematics only.

28 students are not good in any of the three courses.

---------------------------------

I am going to say that:

A is the number of students good in Math.
B is the number of students good in English.
C is the number of students good in Psychology.

---------------------------------

9 are good in all of the three courses.

This means that: $A \cap B \cap C = 9$

---------------------------------

13 are good in both mathematics and psychology

This means that:

$(A \cap C) + (A \cap B \cap C) = 13$

$(A \cap C) + 9 = 13$

$(A \cap C) = 4$

---------------------------------

15 are good in both mathematics and in English

This means that:

$(A \cap B) + (A \cap B \cap C) = 15$

$(A \cap B) + 9 = 15$

$(A \cap B) = 6$

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16 are good in both English and psychology

This means that:

$(B \cap C) + (A \cap B \cap C) = 16$

$(B \cap C) + 9 = 16$

$(B \cap C) = 7$

---------------------------------

20 are good in psychology

This means that:

$c + (A \cap C) + (B \cap C) + (A \cap B \cap C) = 20$

$c + 4 + 7 + 9 = 20$

$c = 0$

---------------------------------

45 are good in mathematics

This means that:

$a + (A \cap B) + (A \cap C) + (A \cap B \cap C) = 45$

$a + 6 + 4 + 9 = 45$

$a = 26$

---------------------------------

Question a:

$a = 26$ , which means that 26 students are good in mathematics only.

---------------------------------

Question b:

At least one is:

$a + (A \cap B) + (A \cap C) + (B \cap C) + (A \cap B \cap C) = 26 + 6 + 4 + 7 + 9 = 52$

Thus, 80 - 52 = 28

28 students are not good in any of the three courses.

A similar problem is given at: brainly.com/question/22003843

4 0

2 years ago

-5 (1-5x) +5 (-8x-2)=-4x-8x need a worked out answer for x plz help me

xz_007 [3.2K]

The work inside parentheses cannot be carried out as shown, so the next approach to consider is multiplying the expressions inside the parentheses by -5 and 5 respectively:

-5 + 25x - 40x - 10 = -4x - 8x (Are you sure it's really "-4x - 8x"?)

Combining the x-terms:

-5 - 15x - 10 = -12x

Combining all like terms: -15 = 3x, so that x = -5 (answer)

3 0

2 years ago

Pls help! will give brainlist!

Rainbow [258]

Answer:

C) The solution for the system of equations

Step-by-step explanation:

Point (3, 120) is where both lines intercept!

Basically, (3, 120) is where both equations are equal to each other.

(120 = 20(3) + 60) = (120 = 40(3))

We can test it!

120 = 20(3) + 60

120 = 60 + 60

120 (Correct)

120 = 40(3)

120 = 120 (Correct)

7 0

3 years ago

The perimeter of Jonah's square backyard is 56 meters. What is the area of Jonah's backyard?

KonstantinChe [14]

56 / 4 = 14

14 x 14 =196msquared

6 0

3 years ago

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Please help me I need help

iris [78.8K]

The answer is B as far as I know

3 0

3 years ago

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