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3 years ago

Help would be appreciated:)

Mathematics

1 answer:

Natali5045456 [20]3 years ago

5 0

Answer:

<BCE=130°

Step-by-step explanation:

<BCE + <HCE=180° (Angles on a straight line)

<BCE+50°=180°

<BCE=180°-50°

<BCE=130°

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ale4655 [162]

Y=-3/2x+4

The slope is -3/2, since Kerry traveled three feet and only went down 2.

The y intercept is 4, since she started four feet above the origin

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3 years ago

If the critical z-value for a hypothesis test... If the critical z-value for a hypothesis test equals 2.45, what value of the te

schepotkina [342]

Answer: z score = 0.00714

Step-by-step explanation: the value of test statistics is gotten using the standard normal distribution table.

Z= 2.45 has area to the left (z<2.45) and area to the right (z>2.45).

Level of significance α is the probability of committing a type 1 error. The area under the distribution is known as the rejection region and it is the area towards the right of the distribution.

The table I'm using is towards the left of the distribution.

But z>2.45 + z<2.45 = 1

z> 2.45 = 1 - z<2.45

But z < 2.45 = 0.99286

z > 2.45 = 1 - 0.99286

z >2.45 = 0.00714

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3 years ago

Please help me i need this really bad

lesya [120]

The answer is 3
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3 years ago

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A painting is 2 in tall and 3 in wide. If it is enlarged to a width of 15 in then how tall will it be?

vekshin1

Answer:

10 in

Step-by-step explanation:

Old proportions:

2 x 3

New proportions

h x 15

Assuming the painting has been increased by a constant scale factor.

Where x is the unknown scale factor, and h is the height after it has been enlarged.

$3 * x = 15\\2 * x = h$

Rearrange second equation:

$3 * x = 15\\x =\frac{h}{2}$

Substitute:

$3*\frac{h}{2} =15\\\frac{h}{2}=5\\h=10$

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3 years ago

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Assume that 155 students are surveyed and every student takes at least one of the following languages. The results of the survey

balu736 [363]

Answer:

91 people take Russian

26 people take French and Russian but not German

Step-by-step explanation:

To solve this problem, we must build the Venn's Diagram of this set.

I am going to say that:

-The set A represents the students that take French.

-The set B represents the students that take German

-The set C represents the students that take Russian.

We have that:

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

In which a is the number of students that take only Franch, A \cap B is the number of students that take both French and German , A \cap C is the number of students that take both French and Russian and A \cap B \cap C is the number of students that take French, German and Russian.

By the same logic, we have:

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

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

This diagram has the following subsets:

$a,b,c,(A \cap B), (A \cap C), (B \cap C), (A \cap B \cap C)$

There are 155 people in my school. This means that:

$a + b + c + (A \cap B) + (A \cap C) + (B \cap C) + (A \cap B \cap C) = 155$

The problem states that:

90 take Franch, so:

$A = 90$

83 take German, so:

$B = 83$

22 take French, Russian, and German, so:

$A \cap B \cap C = 22$

42 take French and German, so:

$A \cap B = 42 - (A \cap B \cap C) = 42 - 22 = 20$

41 take German and Russian, so:

$B \cap C = 41 - (A \cap B \cap C) = 41 - 22 = 19$

22 take French as their only foreign language, so:

$a = 22$

Solution:

(1) How many take Russian?

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

$C = c + (A \cap C) + 19 + 22$

$C = c + (A \cap C) + 41$

First we need to find $A \cap C$ , that is the number of students that take French and Russian but not German. For this, we have to go to the following equation: