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2 years ago

Discriminant for 2x^2+5x-8= -13

Mathematics

1 answer:

Alika [10]2 years ago

8 0

2x²+5x+5=0

Delta= b²-4ac
25-4(2)(5)
25-40
-15

Discriminant=-15
(No roots)

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If Benito is selecting samples of five values from the table, which row will result in the greatest mean? Population Data Row 1

Vilka [71]

Answer:

4th row will result in the greatest mean.

Step-by-step explanation:

We are asked to find the row with greatest mean from our given rows.

We will use formula $\bar{x}=\frac{\Sigma x}{n}$ , where,

$\bar{x}=\text{Mean}$ ,

$\Sigma x=\text{Sum of all data values}$ ,

$n=\text{Number of data points in sample}$

Let us find mean of each row using above formula.

$\text{Mean of row 1}=\frac{4+2+2+3+3}{5}$

$\text{Mean of row 1}=\frac{14}{5}$

$\text{Mean of row 1}=2.8$

Therefore, mean of 1st row is 2.8.

$\text{Mean of row 2}=\frac{3+3+4+3+2}{5}$

$\text{Mean of row 2}=\frac{15}{5}$

$\text{Mean of row 2}=3$

Therefore, mean of 2nd row is 3.

$\text{Mean of row 3}=\frac{2+4+3+4+3}{5}$

$\text{Mean of row 3}=\frac{16}{5}$

$\text{Mean of row 3}=3.2$

Therefore, mean of 3rd row is 3.2.

$\text{Mean of row 4}=\frac{3+4+4+7+3}{5}$

$\text{Mean of row 4}=\frac{21}{5}$

$\text{Mean of row 4}=4.2$

Therefore, mean of 4th row is 4.2.

Since 4th row has the highest mean, therefore, 4th row will result in the greatest mean.

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3 years ago

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Vaselesa [24]

Answer:

Step-by-step explanation:

3x+11=125

3x+11(-11)=125(-11)

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4 years ago

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Answer: d=42

Step-by-step explanation:

Both angles are in a supplementary (straight with 180 degrees) line bisected by an angle, so use the supplementary angle theory

(d+7)+(3d+5)=180

4d+12=180

4d=168

d=42

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2 years ago

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What is the simplest form of this expression? <br>5(-b+2) 47

Delvig [45]

5(-b+2) 47

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(-5b+10)47

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-235b+470

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4 years ago

What is 3/4 * 2 1/2 * 4/5

AveGali [126]

Apparently the answer is 11.7

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