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Lina20 [59]
2 years ago
8

Simplify (2x2−4x+5)+(x2+3x−7)and put in standard form.

Mathematics
2 answers:
elena-s [515]2 years ago
6 0

Answer:

3x^2 - x - 2 (simplified)

3x^2 - x = 2 (standard form)

Step-by-step explanation:

Pavlova-9 [17]2 years ago
3 0

Answer:

3x^2 - x - 2

Step-by-step explanation:

<u>Step 1:  Combine like terms</u>

(2x^2- 4x + 5) + (x^2 + 3x - 7)

2x^2 - 4x + 5 + x^2 + 3x - 7

(2x^2 + x^2) + (-4x + 3x) + (5 - 7)

3x^2 - x - 2

Answer:  3x^2 - x - 2

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The difference in the sample proportions is not statistically significant at 0.05 significance level.

Step-by-step explanation:

Significance level is missing, it is  α=0.05

Let p(public) be the proportion of alumni of the public university who attended at least one class reunion  

p(private) be the proportion of alumni of the private university who attended at least one class reunion  

Hypotheses are:

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H_{a}: p(public) ≠ p(private)

The formula for the test statistic is given as:

z=\frac{p1-p2}{\sqrt{{p*(1-p)*(\frac{1}{n1} +\frac{1}{n2}) }}} where

  • p1 is the sample proportion of  public university students who attended at least one class reunion  (\frac{808}{1311}=0.616)
  • p2 is the sample proportion of private university students who attended at least one class reunion  (\frac{647}{1038}=0.623)
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  • n1 is the sample size of the alumni from public university (1311)
  • n2 is the sample size of the students from private university (1038)

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