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3 years ago

What is (-8)+11x[-2-(-4)=?

1 answer:

7 0

−8+11x[−2−(−4)]=−8+22x
=22x−8

Hope I helped, and if I did, than feel free to vote brainliest

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A group of students estimated the length of one minute without reference to a watch or clock, and the times (seconds) are list

Kitty [74]

Answer:

It does not appear that, as a group, the students are reasonably good at estimating one minute.

Step-by-step explanation:

We are given the following data in the question:

75, 88, 51, 73, 49, 31, 69, 74, 72, 59, 72, 81, 99, 101, 73

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{1067}{15} = 71.13$

Sum of squares of differences = 4739.733

$S.D = \sqrt{\frac{4739.733}{14}} = 18.39$

Population mean, μ = 60 minutes

Sample mean, $\bar{x}$ = 71.13 minutes

Sample size, n = 15

Alpha, α = 0.10

Sample standard deviation, s = 18.39 minutes

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 60\text{ minutes}\\H_A: \mu \neq 60\text{ minutes}$

We use Two-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{71.13 - 60}{\frac{18.39}{\sqrt{15}} } = 2.34$

Calculating the p-value from the table, we have,

P-value = 0.034354

Since the p-value is lower than the significance level, we fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.

Thus, we conclude that it does not appear that, as a group, the students are reasonably good at estimating one minute.

7 0

3 years ago

Line l has a slope of 98. The line through which of the following pair of points is perpendicular to l? A. (−9,−6),(3,3) B. (9,−

Valentin [98]

We can employ some logic to reduce the answers we need to test. We know that the slope perpendicular to line l has to have a negative reciprocal slope, so a slope of $-\frac{9}{8}$ . We see that in A and C, as x increases so does y. That means the slope of these equations are positive, which we don't want. Now for some algebra:

$m=\frac{y_2-y_1}{x_2-x_1} \implies\\ B. \frac{6+2}{-6-9}=\frac{8}{-15} \\ D. \frac{3+5}{-6-3}=-\frac{8}{9}$

We se that D has the correct slope so that must be the answer.

6 0

3 years ago

Read 2 more answers

Shannon's little brother is 7 weeks old. She is exactly

Shalnov [3]

Answer:

1147 days

Step-by-step explanation:

3x365= 1095

7x7=49

1095+49+3=1147

4 0

3 years ago

Read 2 more answers

A stone is an old unit of weight used in Ireland and England to measure potatoes.A stone is 14 pounds and 80 stones make up half

Aneli [31]

Answer: Half of a ton equals to 1,120 pounds.

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

Since 80 stones make up half of a long ton, and each stone weight is 14 pounds, to obtain the number of pounds in half of a long ton we simply have to multiply the number of stones (80) by the weight of each stone (14)

Mathematically speaking:

14 x 80 = 1,120 pounds

Half of a ton equals to 1,120 pounds.

7 0

4 years ago

Read 2 more answers

Of all the listeners who call the local radio station on the telephone , 60% are between the ages of 15 and 25. a random number

aivan3 [116]

Answer:

Step-by-step explanation:

1 will be B, dont know bout 2

7 0

3 years ago