3 years ago

HELP ME PLEASE!!!!!!!!!

Mathematics

1 answer:

bekas [8.4K]3 years ago

6 0

Answer:

what grade?

Step-by-step explanation:

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The expression 5x+7x can be simplified into which of the following ?

zvonat [6]

Answer:

12x

Step-by-step explanation:

You can add the like terms (which have x)

5x+7x=12x

8 0

3 years ago

Does anybody know it need it soon as possible

igomit [66]

Answer:

Step-by-step explanation:

anything to the power of 0 is 1

5 0

2 years ago

If the standard deviation of a set of data is zero, what can you conclude about the set of values? The sum of the deviations fro

Rashid [163]

Answer:

All values are identical.

Step-by-step explanation:

We are given the following in the question:

If the standard deviation of a set of data is zero.

Then, all the values in data are identical.

This can be shown as:

Let all the terms in data be x.

Formula:

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

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

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

$Mean =\displaystyle\frac{nx}{n} = x$

Sum of squares of differences =

$\displaystyle\sum (x_i - x)^2 = 0$

$\sigma = \sqrt{\frac{0}{n}} = 0$

Thus, the correct answer is

All values are identical.

3 0

3 years ago

Of 1800 students enrolled in school 55% are girls. of the girls attending this school 30% take the bus to school

leonid [27]

55% of 1800 = 0.55(1800) = 990...so there are 990 girls in the school

30% of 990 = 0.30(990) = 297...so there are 297 girls who take the bus

7 0

3 years ago

<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7Bx%5E%7B2%7D%20-%201%20%7D%20%20-%20%20%5Cfrac%7B1%7D%7Bx%20-%201%7D%20" id

Degger [83]

Answer:

-x/x^2-1

Step-by-step explanation:

-x^2+x/x^3-x^2-x+1

x(-x+1)/(x+1)(x-1)(x-1)

-x/x^2-1

5 0

3 years ago