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3 years ago

Help with these two figured and you shall be granted points. Good deal, half off.

Mathematics

1 answer:

STALIN [3.7K]3 years ago

7 0

Answer:

5. C - 180ft²

6. D - 120m³

Step-by-step explanation:

(6.5 x 11) = 71.5

(6 x 2.5) = 15

(6 x 11) = 66

(2.5 x 11) = 27.5

((7.5 x 4)/2)(8) = 120

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A 90 percent confidence interval for the slope of a regression line is determined to be (-0.181, 1.529). Which of the following

GenaCL600 [577]

Answer: a. The correlation coefficient of the data is positive.

Step-by-step explanation:

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

Here , confidence interval : (-0.181, 1.529)

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.

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2 years ago

Three numbers have a sum of 82. The second number is twice the first number. The third number is 7 more than the second number.

iVinArrow [24]

Answer: The number is 15

Step-by-step explanation: basically the equation you should solve is

(x)+(2x)+(2x+7)=82

5x+7=82

5x= -7+82

5x=75

5/5x=75/5

x=15

3 0

3 years ago

How many terms are in the expression 2m²n + 2mn² - m + 3n + 9

IgorC [24]

Answer:

12 constant terms and 12 variable terms

Step-by-step explanation:

6 0

2 years ago

Simplify -|-5+2| <br> A. -7 <br> B. -3<br> C. 3<br> D. 7

musickatia [10]

Answer:

the correct anwser is -3 and if you need anymore help the website i use is

Step-by-step explanation:

https://www.tiger-algebra.com

6 0

3 years ago

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Use a scientific calculator or unit circle to convert the polar form of the complex number to its equivalent rectangular form.

GuDViN [60]

I assume 3.14 is meant to represent π. So x=32cos(π/3)=16 and y=32sin(π/3)=16√3=27.7128 approx.
If we take 3.14 directly (radians), then we get x=16.0147 and y=27.7043 approx.

5 0

3 years ago

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