All categories

3 years ago

Is this correct or no?

Mathematics

2 answers:

Vikentia [17]3 years ago

8 0

Answer: The steps are not correct in several places. The correct result is "x > 2"

Explanation:

First row: they multiply both sides by 2, but on the right hand side the multiplication should act on the entire term "(3-2x)" so 2(3-2x)=6-4x

Second row should be now: 3x-8 > 6-4x | now adding 8 to both sides:

Third row should look like this : 3x > 14 - 4x

Fourth row: we want to bring the term 4x to the left so it should be something like this:

3x > 14 - 4x | add "4x" to both sides

which results in

3x + 4x > 14 - 4x + 4x

7 x > 14 | divide both sides by 7

x > 14/7

x > 2

Let me know if you have questions

Tanya [424]3 years ago

4 0

Yes.??? dont really Know sorry

You might be interested in

Find the measure of the arc or angle indicated

Zarrin [17]

Answer:

vdeuvhgcdfckzjhcvod ygxyfdcDcv

Step-by-step explanation:

7 0

2 years ago

A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate exec

Firdavs [7]

Answer:

554 executives should be surveyed.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Standard deviation of 3 hours.

This means that $\sigma = 3$

The 95% level of confidence is to be used. How many executives should be surveyed?

n executives should be surveyed, and n is found with $M = 0.25$ . So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.25 = 1.96\frac{3}{\sqrt{n}}$

$0.25\sqrt{n} = 1.96*3$

$\sqrt{n} = \frac{1.96*3}{0.25}$

$(\sqrt{n})^2 = (\frac{1.96*3}{0.25})^2$

$n = 553.2$

Rounding up:

554 executives should be surveyed.

8 0

2 years ago

Umnica [9.8K]

The system of equations x+y=46 and 15x+9y=396 could be used to find the number of boxes of each item sold.

Step-by-step explanation:

Given,

Cost of one box of raspberry scones = $15.00

Cost of one box of lemon poppy seed muffins = $9.00

Total boxes sold = 46

Total revenue earned = $396

Let,

x be the number of raspberry scones sold.

y be the number of lemon poppy seed muffins sold.

According to given statement;

x+y=46 Eqn 1

15x+9y=396 Eqn 2

The system of equations x+y=46 and 15x+9y=396 could be used to find the number of boxes of each item sold.

8 0

2 years ago

Given that a/b = 3/5 and b/c = 4/5<br> Find a:b:c

Taya2010 [7]

Answer:

12:20:25

I thnk this is it. I'm not sure though

6 0

1 year ago

Anthony sold 45 tickets to the school play and Katy sold 40 tickets. What is the ratio of the number of tickets Anthony sold to

Sindrei [870]

Answer:

the answer is 40:45

Step-by-step explanation:

i did the test and got it right

3 0

2 years ago