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3 years ago

Help me out plzzzzzz

Mathematics

2 answers:

Komok [63]3 years ago

7 0

Answer:

......................

Minchanka [31]3 years ago

4 0

Answer:

A=4, B=3, C=2, D=7 or A=2, B=7, C=4, D=3

Step-by-step explanation:

To factor this, you are looking for factors of 8×21 = 168 that have a sum of 34.

168 = 1×168 = 2×84 = 3×56 = 4×42 = 6×28 = 7×24 = 8×21 = 12×14

The sums of these factor pairs are 169, 86, 59, 46, 34, 31, 29, 26. The factor pair whose sum is 34 is 6×28. This means we can rewrite the expression as ...

8x² +28x +6x +21

Factoring by pairs gives ...

4x(2x +7) +3(2x +7)

(4x +3)(2x +7) ⇒ A=4, B=3, C=2, D=7 or A=2, B=7, C=4, D=3

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a dog runs 54km in just 3days ,it runs 2km more each day . how many kilometers does it run for the first 2 days?

Lesechka [4]

Let x be the distance it runs on the first day, then:-

x + x + 2 + x + 4 = 54

3x + 6 = 54

3x = 54 - 6 = 48

x = 48/3 = 16 km

So for the first 2 days it runs 16 + 18 = 34 km. Answer

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3 years ago

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Either B or C. They look exactly the same but I can’t tell because the photo is blurry

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3 years ago

A true-false quiz with 10 questions was given to a statistics class. Following is the probability distribution for the score of

disa [49]

Answer:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

Step-by-step explanation:

For this case we assume the following probability distribution:

X 5 6 7 8 9 10

P(X) 0.05 0.15 0.33 0.28 0.12 0.07

First we need to find the expected value (first moment) and the second moment in order to find the variance and then the standard deviation.

In order to calculate the expected value we can use the following formula:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

In order to find the standard deviation we need to find first the second moment, given by :

$E(X^2)=\sum_{i=1}^n X^2_i P(X_i)$

And using the formula we got:

$E(X^2)=(5^2 *0.05)+(6^2 *0.15)+(7^2 *0.33)+(8^2 *0.28)+ (9^2 *0.12 +(10^2 *0.07))=57.46$

Then we can find the variance with the following formula:

$Var(X)=E(X^2)-[E(X)]^2 =57.46-(7.48)^2 =1.5096$

And then the standard deviation would be given by:

$Sd(X)=\sqrt{Var(X)}=\sqrt{1.5096}=1.229$

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4 years ago

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Based on the graph of the line below, which describes the relationship between the value of the y-intercept and the

stepan [7]

Answer:

y intercept = 3

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Step-by-step explanation:

Given

The attached graph

Required

Determine the slope and the y intercept

The $y\ intercept$ is at the point where $x = 0$ .

From the graph:

$y = 3;\ when\ x = 0$

Hence,

y intercept = 3

Next, we calculate the slope using:

$m = \frac{y_1 - y_2}{x_1 - x_2}$

Where:

$(x_1,y_1) = (0,3)$

$(x_2,y_2) = (9,6)$

So, we have:

$m = \frac{3 - 6}{0 - 9}$

$m = \frac{-3}{- 9}$

$m = \frac{3}{9}$

$m = \frac{1}{3}$

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3 years ago

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Vesna [10]

Answer:

$16$

Step-by-step explanation:

$4+12$

$16$

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3 years ago

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