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2 years ago

10

which numbers are irrational? check all that apply. square root of 196, square root of 80, square root of 16, pi, square root of

12, and 7/18

1 answer:

Vilka [71]2 years ago

7 0

Answer: $\sqrt{80}$ , $\pi$ , $\sqrt{12}$

Step-by-step explanation:

these are all irrational! hope this helped you :3.

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What is the probability of tossing a coin three times and getting tails each time?

telo118 [61]

Answer:

1/8

Step-by-step explanation:

This is a compund probability problem. You need to find the probability of each event and then multiply the probabilities together.

The probability of flipping tails is 1/2. We need three of these.

1/2 x 1/2 x 1/2 = 1/8

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2 years ago

A 90% confidence interval for the mean height of students

Westkost [7]

Answer:

$ME= \frac{69.397-60.128}{2}= 4.6345 \approx 4.635$

And the best answer on this case would be:

b) m = 4.635

Step-by-step explanation:

Let X the random variable of interest and we know that the confidence interval for the population mean $\mu$ is given by this formula:

$\bar X \pm t_{\alpha/2} \frac{s}{\sqrt{n}}$

The confidence level on this case is 0.9 and the significance $\alpha=1-0.9=0.1$

The confidence interval calculated on this case is $60.128 \leq \mu \leq 69.397$

The margin of error for this confidence interval is given by:

$ME =t_{\alpha/2} \frac{s}{\sqrt{n}}$

Since the confidence interval is symmetrical we can estimate the margin of error with the following formula:

$ME = \frac{Upper -Lower}{2}$

Where Upper and Lower represent the bounds for the confidence interval calculated and replacing we got:

$ME= \frac{69.397-60.128}{2}= 4.6345 \approx 4.635$

And the best answer on this case would be:

b) m = 4.635

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2 years ago

Write the equation of the line that passes through (1, 3) and has a slope of 2 in point-slope form

raketka [301]

Answer:

y-3= 2(x-1)

Step-by-step explanation:

1. The equation of a line in point slope form is y-y1= m(x-x1)

2. m=slope and (x1,y1) is the point the line passes through

3. The point the line passes through is (1,3)

4, The slope is 2

5. Therefore the answer is y-3=2(x-1)

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2 years ago

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frez [133]

Use pythagorean therom, so A^2 would be 12 since it’s the same lengths the square sides, and C^2 is 20. X= 16

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3 years ago

The point (x, y) is the top of a polygon. Which point would it map to if the polygon were reflected over the y-axis and then tra

Pachacha [2.7K]

It’s either b or C because your going down.... but I think it’s B

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3 years ago