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2 years ago

Здравствуйте, можете пожалуйста помочь?

Mathematics

1 answer:

atroni [7]2 years ago

7 0

Hi!

(1)

$\boldsymbol{(7x+y)-(-x-2y)}$

Step 1: Distribute the minus.

$\boldsymbol{(7x+y)+x+2y}$

Step 2: Combine like terms.

$\boldsymbol{7x+y+x+2y}$

$\boldsymbol{7x+x+y+2y}$

$\boldsymbol{8x+3y}$ <- Answer.

(2)

$\boldsymbol{(b-3)+(2b+2)}$

Step 1: Simplify.

$\boldsymbol{b-3+2b+2}$

Step 2: Combine like terms.

$\boldsymbol{b+2b-3+2}$

$\boldsymbol{3b-1}$ <- Answer.

(3)

$\boldsymbol{3x(4y-z)}$

Step 1: Distribute 3x.

$\boldsymbol{12xy-3xz}$ <- Answer.

(4)

$\boldsymbol{2a(3b-7)}$

Distribute 2a:

$\boldsymbol{6ab-14a}$

Hope that helped! :)

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PLS ESTIMATE/ 67% of 8.7

Studentka2010 [4]

67 percent of 8.7

$\frac{67}{100} \times \frac{x}{8.7}$
$100x = 67 \times 8.7$

$100x = 582.9$

Divide by 100 on both sides to isolate the x

$x = 5.829$
Round up (to the nearest tenth place and whole number)

$x = 6$
$x = 5.8$

7 0

3 years ago

Read 2 more answers

The difference between eight times a number and three is equal to negative nineteen. What is the number?

Alex777 [14]

Answer:

The number is -2.

Step-by-step explanation:

From the word problem, we can figure out the equation for the unknown number (x).

8x-3=-19

We would then work out the equation to find x.

Add 3 to -19.

8x=-16

Divide -16 by 8.

x=-2

7 0

3 years ago

following frequency distribution shows the daily expenditure on milk of 30 households in a locality:Daily expenditure on milk(in

valina [46]

Note: As you missed to identify what we have to find in this question. But, after a little research, I am able to find that we had to find the Mode for the data given in your question. So, I am assuming we have to calculate the the Mode. Hopefully, it would clear your concept regarding this topic.

Answer:

The mode of the data = 75

Step-by-step explanation:

Lets visualize the given data in a table to show the frequency distribution:

Daily expenditure on milk (in Rs) Number of households

0-30 5

30-60 6

60-90 9

90-120 6

120-150 4

Here the maximum frequency is 9.

So, modal class is 60-90.

As the formula to calculate the mode:

$Mode = l_{1} + h (\frac{f_{1}-f_{0}}{2f_{1}-f_{0}-f_{2}} )$

Here, the maximum

$l_{1} =60, f_{1} =9, f_{0}=6, f_{0}=6, h=30$

$l=$ is the lower limit of the class

$f_{1} =$ is the frequency of the modal class

$f_{0} =$ is the frequency of the previous modal class

$f_{2} =$ is the frequency of the next previous modal class

$l=$ is the class size

So,

$Mode = l_{1} + h (\frac{f_{1}-f_{0}}{2f_{1}-f_{0}-f_{2}} )$

$Mode = 60 + 30 (\frac{9-6}{2(9)-6-6} )$

$Mode = 60 + \frac{(30)(3)}{6}$

$Mode = 60 + 15=75$

∴ The mode of the data = 75

Keywords: mode, frequency distribution

Learn more about mode and frequency distribution from brainly.com/question/14354368

#learnwithBrainly

5 0

3 years ago

The partial pressure of carbon dioxide in a mixture is 0.31 atm.

juin [17]

Answer:

$P_{Co2}= X_{Co2} P_{tot}$

Where $P_{tot}$ represent the total pressure and $X_{Co2}$ the fraction of carbon dioxide is 0.46 and we can find the total pressure with this formula:

$P_{tot}= \frac{P_{Co2}}{X_{Co2}}$

And replacing we got:

$P_{tot}= \frac{0.31 atm}{0.46}= 0.674 atm$

Step-by-step explanation:

For this case the partial presure of carbon dioxide is given by:

$P_{Co2}= X_{Co2} P_{tot}$

Where $P_{tot}$ represent the total pressure and $x_{Co2}$ the fraction of carbon dioxide is 0.46 and we can find the total pressure with this formula:

$P_{tot}= \frac{P_{Co2}}{X_{Co2}}$

And replacing we got:

$P_{tot}= \frac{0.31 atm}{0.46}= 0.674 atm$

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3 years ago

Is collecting Taxes a Delegated power Reserved power Concurrent power

Lina20 [59]

Answer: C.concurrent power

Step-by-step explanation: Such powers are called concurrent powers. These include the power to tax, spend, and borrow money. State governments operate their own judicial systems, charter corporations, provide public education, and regulate property rights.

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3 years ago