Martin finds a shirt on sale for 20% off at a department store. The original price was $20. Martin must also pay a 7.5% sales ta
2 answers:
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Solving the system of equations, it is found that a viable time that the trains are side by side is given by:
B. 15 sec
<h3>What is a system of equations?</h3>A system of equations is when two or more variables are related, and equations are built to find the values of each variable.
In this problem, the equations are:
They will be side by side when:
It's solution is a quadratic function with coefficients a = 14, b = -130, c = -1200, hence:
Time is a non-negative measure, hence option B is correct.
More can be learned about a system of equations at brainly.com/question/24342899
The 90% confidence interval for the true difference between the population proportions is [ - 0.0908, - 0.0092]
Given,
= 731
= 644
= 0.33
= 0.28
z score for 90% confidence interval = 1.645
Here, the confidence interval formula :
( ) ± z
Substituting the values, we get
(0.33 - 0.28) ± 1.645
= 0.05 ± 1.645
= 0.05 ± 1.645
= 0.05 ± 1.645 × 0.0248093914
= 0. 05 ± 0.0408114489
Confidence interval:
- 0.05 - 0.0408114489 = - 0.0908114489 ≈ - 0.0908
- 0.05 + 0.0408114489 = - 0.0091885511 ≈ - 0.0092
The confidence interval for the true difference between the population proportions is [ - 0.0908, - 0.0092]
Learn more about confidence interval here:brainly.com/question/17421912
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