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kotegsom [21]
3 years ago
8

May somebody help me please

Mathematics
2 answers:
Pepsi [2]3 years ago
6 0

Hi there!

Answer:

 A. 7x² - 9x - 5

Step-by-step explanation:

If you simply take away the parentheses, you get:

3x² - 4x + 7 + 4x² - 5x - 12

Then, just add them all together, and you get:

  A. 7x² - 9x - 5

Let me know if you have any questions!

Arisa [49]3 years ago
5 0

add 3+4=7x². -4-5=-9x. 7-12=-5. Answer : A

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B same form

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By using them for fractions or decimals. You can compare fractions by having them from least to greatest and it helps in getting the same denominator for fractions.

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Answer:

(1) (4.82, 4.98)

(2) Large sample size

(3) Yes, the temperature is within the confidence interval of (37.40, 37.60)

(4) (15.083, 15.117)

Step-by-step explanation:

Confidence Interval (CI) = mean + or - (t×sd)/√n

(1) mean = 4.9, sd = 0.35, n = 68, degree of freedom = n-1 = 68 - 1 = 67

t-value corresponding to 67 degrees of freedom and 95% confidence level is 1.9958

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CI = 4.9 - (1.9958×0.35)/√68 = 4.82

CI is (4.82, 4.98)

(2) Error margin = (t-value × standard deviation)/√sample size

From the formula above, error margin varies inversely as the square root of the sample size. Since the relationship between the error margin and sample size is inverse, increase in one (sample size) will conversely lead to a decrease in the other (error margin)

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t-value corresponding to 99 degrees of freedom and 90% confidence level is 1.6602

CI = 37.5 + (1.6602×0.6)/√100 = 37.5 + 0.10 = 37.60

CI = 37.5 - (1.6602×0.6)/√100 = 37.5 - 0.10 = 37.40

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t-value corresponding to 103 degrees of freedom and 97% confidence interval is 2.2006

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CI = 15.10 - (2.2006×0.08)/√104 = 15.10 - 0.017 = 15.083

CI is (15.083, 15.117)

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