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3 years ago

PLEASE HELP!!

Mathematics

1 answer:

WINSTONCH [101]3 years ago

3 0

The answer would be, B

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write the equation and find the values of x. round side lengths to the nearest tenth and angle measures to the nearest degree

Vlad1618 [11]

Answer:

x = 44°

Step-by-step explanation:

<u>Equation</u>:

cos x = 15/21
cos x = 0.714
x = arccos 0.714
x = 44° (rounded to the nearest degree)

3 0

3 years ago

Can someone help explain this to me? I’d appreciate it a lot.

gregori [183]

When you put + - and x in the spaces, no matter the order, the answer will be a multiple of 4. Therefore you have to use ÷ to get 2 for the answer. The answer is 4÷4+4÷4=2.

7 0

3 years ago

Convert: 4 kiloliters = liters

Lemur [1.5K]

Answer:

4000 liters.

Step-by-step explanation:

1 kiloliter equals to 1000 liters, so 4 kiloliters equals to 4000 liters.

6 0

4 years ago

Read 2 more answers

An unknown data set has a standard deviation of 10. What is the standard deviation when each value in the data set is multiplied

solong [7]

Let $\mathbf x=\{x_i~:~1\le i\le n\}$ be the sample, with $n$ the size of the sample.

The mean of the sample is

$\displaystyle\bar x=\frac1n\sum_{i=1}^nx_i$

Let $\mathbf y$ be the same data set but with each value scaled up by 5. Then the mean here is

$\bar y=\displaystyle\frac1n\sum_{i=1}^ny_i=\frac5n\sum_{i=1}^nx_i=5\bar x$

The standard deviation for $\mathbf x$ is given by

$s_{\mathbf x}=\sqrt{\displaystyle\frac1{n-1}\sum_{i=1}^n(\bar x-x_i)^2}$

For $\mathbf y$ , you would have

$s_{\mathbf y}=\sqrt{\displaystyle\frac1{n-1}\sum_{i=1}^n(\bar y-y_i)^2}$
$s_{\mathbf y}=\sqrt{\displaystyle\frac1{n-1}\sum_{i=1}^n(5\bar x-5x_i)^2}$
$s_{\mathbf y}=\sqrt{\displaystyle\frac{25}{n-1}\sum_{i=1}^n(\bar x-x_i)^2}$
$s_{\mathbf y}=5\sqrt{\displaystyle\frac1{n-1}\sum_{i=1}^n(\bar x-x_i)^2}$
$s_{\mathbf y}=5s_{\mathbf x}$

6 0

3 years ago

….. solve for X………….

DerKrebs [107]

Answer:

x=5

Step-by-step explanation:

these two angles are the same so set both equations equal to each other and solve for x.

$23x-5=21x+5\\23x=21x+10\\2x=10\\x=5$

1. set equations equal to each other

2. add 5 to both sides

3. subtract 21x from both sides

4. divide both sides by 2 to get x alone

5. x=5

5 0

2 years ago