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Allisa [31]
3 years ago
9

Twelve different video games showing substance use were observed and the duration of times of game play​ (in seconds) are listed

below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct a 98​% confidence interval estimate of sigma​, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution.
4,757 4,509 4,221 4,486 4,935   
4,426 4,905 4,822 4,383 4,956
5,043 4,038

Mathematics
1 answer:
enyata [817]3 years ago
6 0

Answer:

Step-by-step explanation:

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Find the other endpoint of the line segment with the given endpoint and midpoint? Endpoint (3,1) midpoint (-10,-5)
Sav [38]
(-23,-11) is the other endpoint due to (a+b/2)
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3 years ago
What is the slope of the line tangent to the graph of y = (9x^2)/(x+2) at x = 1 ?
lidiya [134]

Using derivatives, it is found that the slope of the line tangent to the graph of y at x = 1 is of 5.

The equation is:

y(x) = \frac{9x^2}{x + 2}

The slope of the line tangent to the graph of y at x = 1 is y^{\prime}(1).

Applying the quotient rule, we have that:

y^{\prime}(x) = \frac{[9x^2]^{\prime}(x + 2) - [x + 2]^{\prime}(9x^2)}{(x + 2)^2}

y^{\prime}(x) = \frac{18x(x + 2) - 9x^2}{(x + 2)^2}

y^{\prime}(x) = \frac{9x^2 + 36x}{(x + 2)^2}

Then, when x = 1:

y^{\prime}(1) = \frac{9(1)^2 + 36(1)}{(1 + 2)^2} = \frac{45}{9} = 5

The slope of the line tangent to the graph of y at x = 1 is of 5.

You can learn more about the use of derivatives to find the slope of a tangent line at brainly.com/question/10580177

6 0
3 years ago
Write the quadratic equation in general form. (x - 3)2 = 0 x2 + 9 = 0 x2 + 6x + 9 = 0 x2 - 6x + 9 = 0
professor190 [17]
The quadratic equation (x - 3)^2 = 0 in general form is x^2 - 6x + 9 = 0.
4 0
3 years ago
Read 2 more answers
I need number 15 and this was cut out: if x=3.​
crimeas [40]

Answer:

x^0/3^2 (^ means to the power) and  3x^-4. The second and last answer choices are the correct answers.

Step-by-step explanation:

1. Solve each problem by plugging in the 3. For (3/x^2)^0, plug in the 3 in replacement of x. Now it is (3/x^2)^0 (3 divided by x squared to the power of 0). 3 squared is equal to 9, and 3/9 is simplified to 1/3. Now the equation is (1/3)^0 (1/3 to the power of 0). 1/3 to the power of 3 is one because any number that has a power of 0 is equal to 1. For the first answer choice, the answer is 1, and 1 is not less the 1, it is equal to 1, so the choice wouldn't be correct.

2. In the second answer choice, x^0/3^2 (x to the power of 0/3 to the power of 2), you first have to first replace the x with a 3. The new equation would be 3^0/3^2 (3 to the power of 0 divided by 3 to the power of 2). Now we have to figure out what 3^0 (x to the power of 0). Since anything to the power of 0 is equal to 1, 3 to the power of 0 would be 1. 3 to the power of 2 is equal to 3 times 3, which equals 9. 1 divided by 9 is equal to 1/9. 1/9 is less than 1 so answer choice number 2 would be correct.

3. In the third answer choice, 1/6^-x (1 divided by 6 to the -x power), you have to plug in the 3 where the x was. Now the equation would be 1/6^-3 (1 divided by 6 to the power of -3). We have to now figure out what 6^-3 (6 to the power of -3). 6^-3 is 1/216. The equation is now 1/1/216, which equals 216, so answer choice number 3 is not correct since 216 is greater than 1 not less than 1.

4. In the fourth answer choice, 1/x^-3 (1 divided by x to the power of -3), you have to substitute x for 3. Now the equation would be 1/3^-3 (1 divided by 3 to the power of -3). Now we have to solve for 3^-3(3 to the power of -3). 3^-3 is 1/27. Now the equation is 1/1/27, which is the same as 27. 27 is not less than 1, so answer choice number four is incorrect.

5. In the fifth answer choice, 3x^-4 (3x to the power of -4), you have to first substitute x for 3. The new equation is 3 × (3^-4). According to PEMDAS, we have to first multiply 3^-4, not 3 times 3. 3^-4 (3 to the power of -4) is equal to 1/81. 3 times 1/81 is equal to 1/27. 1/27 is less than 1 so the answer is correct.

As a result, the second and last answer choices are the correct answers.

7 0
3 years ago
Please please please help
AnnyKZ [126]
Hey I would love to help could you type out the question in the comments under my answer so I can reply the answer it’s difficult to read in the image provided
8 0
3 years ago
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