How do you know what to round a number by when it doesn't say it

Mathematics

1 answer:

Dmitrij [34]3 years ago

4 0

Answer:

Most of the time if it doesn't say our should round up it's best to leave the number as it is.However in some situations this isn't possible.For instance if there are to be a recurring decimal like 47.47485... it would be best to round to the nearest to decimal places so-47.47 unless told otherwise.

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Through: (-3,0), perp. to y = 3x - 1

Marrrta [24]

Answer:

$y=-\dfrac{1}{3}x-1$

Step-by-step explanation:

Given:

line y=3x-1

point (-3,0)

Write: equation of the line that is perpendicular to the given and passes through the point (-3,0)

Solution:

The slope of the given line is $m=3$

If $m_1$ is the slope of perpendicular line, then

$m\cdot m_1=-1\\ \\3m_1=-1\\ \\m_1=-\dfrac{1}{3}$

So, the equation of the needed line is $y=-\dfrac{1}{3}x+b.$

Find b. This line passes through the point (-3,0), so its coordinates satisfy the equation:

$0=-\dfrac{1}{3}\cdot (-3)+b\\ \\0=1+b\\ \\b=-1\\ \\y=-\dfrac{1}{3}x-1$

7 0

3 years ago

A student in a statistics class asks students in a long lunch line about their opinions about the school cafeteria. The sample t

Paladinen [302]

Answer:

The correct option is;

D. Biased

Step-by-step explanation:

A sampling method in which the members of the sample are not representative of the population, such that some members of the population have a higher or lower probability within the sample which is indicative that not all members of the population are sampled

A biased sample is a non random sample and the can lead to misleading data conclusion

In the question, the sampling of student opinion about the school cafeteria among students who are on the lunch line and so prefer the school cafeteria leaves out the portion of the population that get their lunch from alternative sources.

7 0

3 years ago

I need help please. Must be correct. 10 points. Thanks

Anna11 [10]

We have the supplementary angles.

The sum of the measures of the two Supplementary Angles is 180°.

Therefore we have the equation:

13x - 2 + 39 = 180

13x + 37 = 180 subtract 37 from both sides

13x = 143 divide both sides by 13

x = 11

<h3>Answer: 11</h3>