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netineya [11]
3 years ago
9

Simplify the expression: -69 + 7 - 2 + 49

Mathematics
2 answers:
bogdanovich [222]3 years ago
7 0

Answer: -15 is the simplified answer.

Step-by-step explanation:

ser-zykov [4K]3 years ago
5 0

Answer:

-15

Step-by-step explanation:

becuase -69 +7 = -62 -2 =-64 + 49 = -15

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3 years ago
A 90 percent confidence interval for the slope of a regression line is determined to be (-0.181, 1.529). Which of the following
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Answer: a. The correlation coefficient of the data is positive.

Step-by-step explanation:

Estimated slope of sample regression line  = \dfrac{Upper \ limit + lower\ limit}{2}

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Estimated slope of sample regression line  = \dfrac{-0.181+1.529}{2}

=\dfrac{1.348}{2}\\\\=0.674\ \ \ \ [\text{ positive}]

⇒Correlation coefficient(r) must be positive, So a. is true.

But, d. and e. are wrong(0.674 ≠ 0 or 1.348).

We cannot check residuals or its sum from confidence interval of slope of a regression line, so b is wrong.

We cannot say that scatterplot is linear as we cannot determine it from interval, so c. is wrong

So, the correct option : a. The correlation coefficient of the data is positive.

7 0
2 years ago
What is an equation of the line that passes through the points (3,4) and (-4, -3)?
azamat

Answer:

y=x+1

Step-by-step explanation:

1) <u>Find the </u><u>slope</u>

m=-3-4/-4-3

m=-7/-7

m=1

2) <u>Use </u><u>y</u><u>=mx+</u><u>c</u>

<u>by </u><u>using </u><u>the </u><u>point </u><u>(</u><u>3</u><u>,</u><u>4</u><u>)</u>

<u>4</u><u>=</u><u>1</u><u>(</u><u>3</u><u>)</u><u>+</u><u>c</u>

<u>4</u><u>=</u><u>3</u><u>+</u><u>c</u>

<u>c=</u><u>1</u>

3) <u>The </u><u>answer</u>

y=x+1

8 0
2 years ago
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