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2 years ago

Which of the following is not a possible r-value? A.0.3 B.-0.3 C.-1.6 D.0.6

Mathematics

2 answers:

sveta [45]2 years ago

8 0

|r| ≤ 1
selection C cannot be a value of r.

aliya0001 [1]2 years ago

5 0

Answer:

option C $-1.6$

Step-by-step explanation:

we know that

The correlation coefficient r is used in statistics to measure how strong a relationship is between two variables. The value of r is always between $+1$ and $-1$

The value of $-1.6$ is not a possible r-value

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A regular decagon has sides that are 8 cm long. What is the area of the figure? Round to the nearest whole number.

blsea [12.9K]

Given:

Given that the regular decagon has sides that are 8 cm long.

We need to determine the area of the regular decagon.

Area of the regular decagon:

The area of the regular decagon can be determined using the formula,

$A=\frac{s^{2} n}{4 \tan \left(\frac{180}{n}\right)}$

where s is the length of the side and n is the number of sides.

Substituting s = 8 and n = 10, we get;

$A=\frac{8^{2} \times 10}{4 \tan \left(\frac{180}{10}\right)}$

Simplifying, we get;

$A=\frac{64 \times 10}{4 (\tan \ 18)}$

$A=\frac{640}{4 (0.325)}$

$A=\frac{640}{1.3}$

$A=642.3$

Rounding off to the nearest whole number, we get;

$A=642 \ cm^2$

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Hence, Option B is the correct answer.

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2 years ago

Which equation is equivalent to n + 4 = 11? *

dangina [55]

Answer:

(n + 4) *2 = 11 * 2

Step-by-step explanation:

(n + 4) *2 = 11 * 2

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3 years ago

Please answer the correct answer I will give brainliest. Use the graph to write a linear function that relates y to x. y=

Mumz [18]

Answer:

y = 3

Step-by-step explanation:

We need to find the slope. We do so by choosing any two points and dividing the change in the y-coordinates (their difference) by the change in the x-coordinates (their difference). Let's just choose (1, 3) and (0, 3). The slope is: . So, the slope is 0.

We want to write a line in slope-intercept form, which is: y = mx + b, where m is the slope and b is the y-intercept (where the line crosses the y-axis). Here, the slope m = 0. Looking at the graph, we see that the y-intercept is (0, 3), so b = 3. Then, our line is: y = 0x + 3 ⇒ y = 3.

Another note is that this is a horizontal line. One thing to remember is that all horizontal lines have slopes of 0, so their function is simply y = k, where k is a constant through which the line cuts through.

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3 years ago

Find the slope (-6,2) (4,5)

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Slope: $3/10$