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3 years ago

Simplify 2√10 * 3√12 Please don’t guess I beg u

Mathematics

1 answer:

Monica [59]3 years ago

4 0

Answer:

$\large\boxed{2\sqrt{10}\cdot3\sqrt{12}=12\sqrt{30}}$

Step-by-step explanation:

$2\sqrt{10}\cdot3\sqrt{12}=(2\cdot3)\sqrt{10\cdot12}=6\sqrt{120}=6\sqrt{4\cdot30}=6\cdot\sqrt4\cdot\sqrt{30}\\\\=6\cdot2\cdot\sqrt{30}=12\sqrt{30}\\\\\text{used}\ \sqrt{ab}=\sqrt{a}\cdot\sqrt{b}$

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uranmaximum [27]

Answer:

1. 1

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3. -1/125

4. 1/125

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3 years ago

Which of the following equations best represents the regression line for the data given in the

True [87]

The regression equation for the data given is y= -8.57 -2.31x

Step-by-step explanation:

The first step is to form a table as shown below;

x y xy x² y²

1 4 4 1 16

2 1 2 4 1

3 5 15 9 25

4 10 40 16 100

5 16 80 25 256

6 19 114 36 361

7 15 105 49 225

28 60 360 140 984 ------sum

A linear regression equation is in the form of y=A+Bx

where ;

x=independent variable

y=dependent variable

n=sample size/number of data points

A and B are constants that describe the y-intercept and the slope of the line

Calculating the constants;

A=(∑y)(∑x²) - (∑x)(∑xy) / n(∑x²) - (∑x)²

A=(60)(140) - (28)(360) / 7(140)-(28)²

A=8400 - 10080 /980-784

A= -1680/196

A= - 8.57

B= n(∑xy) - (∑x) (∑y) / n(∑x²) - (∑x)²

B= 7(360)-(28)(60) / 7(60) - (28)²

B=2520 - 1680 /420-784

B=840/-364

B= -2.31

y=A+Bx

y= -8.57 -2.31x

Learn More

Regression equation :brainly.com/question/12280902

Keywords : equations, regression line, data

#LearnwithBrainly

7 0

3 years ago

Solve the formula V=pir^2h for r <br><br> PLEAASSSEEE HELP

otez555 [7]

Answer:

Step-by-step explanation:

So we have the formula:

$V=\pi r^2h$

And we want to solve it for r.

So, let's first divide both sides by π and h. This will cancel out the right side:

$r^2=\frac{V}{\pi h}$

Now, take the square root of both sides:

$r=\sqrt{\frac{V}{\pi h}}$

And we're done!

Our answer is B.

I hope this helps!

7 0

3 years ago

Read 2 more answers

PLEASE HELP IM TIMED NO LINKS OR FILES THESE ARE NOT FREE POINTS WILL REPORT, ALSO I WILL GIVE BRAINLISET TO FIRST PERSON THAT A

Alex777 [14]

Answer:

t=-28

Step-by-step explanation:

4 0

2 years ago

A researcher records the repair cost for 8 randomly selected washers. A sample mean of $60.46 and standard deviation of $18.36 a

Anuta_ua [19.1K]

Answer:

The critical value is T = 1.895.

The 90% confidence interval for the mean repair cost for the washers is between $48.159 and $72.761

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 8 - 1 = 6

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 6 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.9}{2} = 0.95$ . So we have T = 1.895, which is the critical value.

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 1.895\frac{18.36}{\sqrt{8}} = 12.301$

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 60.46 - 12.301 = $48.159

The upper end of the interval is the sample mean added to M. So it is 60.46 + 12.301 = $72.761

The 90% confidence interval for the mean repair cost for the washers is between $48.159 and $72.761

8 0

3 years ago