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Tanya [424]
3 years ago
9

Solve using the quadratic formula. 7q² – 9q- 1=0

Mathematics
1 answer:
Mama L [17]3 years ago
6 0

Answer:Q=1.39 or -0.103

Step-by-step explanation:

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one section of wood is 3 5/8 meters long. another section is twice that long. when the two pieces are put together how many is t
madreJ [45]

Answer:

the mixed number form is 10 7/8

8 0
2 years ago
If you have 186 pencils, how many how many will each person get in a class that has 23 students?
Brut [27]

Answer:

8

Step-by-step explanation:

total number of pencils = 186

number of students = 23

number of pencils each student gets = number of pencils ÷ number of pencils

=186/23

=8.08

so each student gets 8 pencils

6 0
3 years ago
Write 2.71 as a simplified fraction.
charle [14.2K]

Answer:

271/100.

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
What is the formula for a confidence interval?
ikadub [295]

Answer:

a) The formula is given by mean \pm the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

b) \bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

If the distribution for X is normal or if the sample size is large enough we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

Part a

The formula is given by mean \pm the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

Part b

The confidence interval for the mean is given by the following formula:  

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

5 0
3 years ago
1. Which angle is congruent to ∠1 ?
Nonamiya [84]
The angles that are congruent to one are 4,5, and 8. So the answer would be B. 5.
5 0
3 years ago
Read 2 more answers
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