All categories

4 years ago

What is the difference of the two expressions?

Mathematics

1 answer:

valkas [14]4 years ago

8 0

<em>Answer is x + 12</em>

<em />

<h2>Explanation:</h2>

Hello! Recall that you have to write clear questions in order to get exact answers. So I'll help you assuming that the two expressions are the following:

First expression:

$2x+9$

Second expression:

$x-3$

So the operation we need to perform is:

$2x+9-(x-3)$

Recall some rules:

$(+)\times (+)=+ \\ \\ (-)\times (-)=+ \\ \\ (-)\times (+)=- \\ \\ (+)\times (-)=-$

Hence:

$2x+9-(x-3)=2x+9-x+3 \\ \\ \\ Combine \ like \ terms: \\ \\ (2x-x)+(9+3) \\ \\ \boxed{x+12}$

<h2>Learn more:</h2>

Simplify: brainly.com/question/1291365

#LearnWithBrainly

You might be interested in

Am I correct ?<br> ( √2 - √3 )² =1 - √2

Arturiano [62]

You are not correct, the right answer should be 5-2 square root symbol. I couldn't find out how to put one there.

4 0

3 years ago

Finding the slope of the line passing through the points

Burka [1]

Slope formula: $\frac{y_2 - y_1}{x_2 - x_1}$

First, you would need to plug the coordinates into the slope formula.
$\frac{6 - 2}{9 + 7}$

Now, all you would have to do is solve and simplify it.
$\frac{6 - 2}{9 + 7}$ = $\frac{4}{16}$ = $\frac{1}{4}$

The slope of the line is $\frac{1}{4}$ .

I hope this helps!

8 0

3 years ago

Read 2 more answers

For a sample of 9 automobiles, the mileage (in 1000s of miles) at which the original front brake pads were worn to 9% of their o

guapka [62]

Answer:

CI =[- 4.588; 15.4]

Since the calculated value of t= 4.244 falls in the critical region so we reject H0 and conclude that we are not confident that the mean difference in lifetime between front and rear brake pads is 99.5%

Step-by-step explanation:

The given data is

Car Rear Front d= rear- front

1 40.6 32.5 8.1

2 35.4 27.1 8.3

3 46.6 35.6 11

4 47.3 35.6 11.7

5 38.7 30.3 8.4

6 51.2 41.1 10.1

7 50.6 40.7 9.9

8 45.9 34.3 11.6

∑ = 89.8

Let the hypotheses be

H0: ud= 0 against the claim Ha: ud ≠0

The degrees of freedom = n-1= 9-1= 8

The significance level is 0.05

The test statistic is

t= d`/sd/√n

The critical region is ║t║≤ t (0.025,8) = ±2.306

Sd= 7.05434553

d`=∑d/n= 89.8/9= 9.978

Therefore

t= d`/ sd/√n

t= 9.978/ 7.054/√9

t= 4.244

1) Since the calculated value of t= 4.244 falls in the critical region so we reject H0 and conclude that we are not confident that the mean difference in lifetime between front and rear brake pads is 99.5%

2) the confidence interval for the difference of two samples can be calculated by

d ` ± td sd/√n

9.978 ±2.306* 7.054/√9

- 4.588; 15.4

7 0

3 years ago

CORRECT??

lutik1710 [3]

Yes your answer is right

3 0

4 years ago

Read 2 more answers

Bill has a box of markers that has a base of 8 cm by 20 cm and a height of 6 cm. Martin’s pencil box has a height 4 cm and the b

nataly862011 [7]

Volume = base x width x height
Bill's Box is 8x20x6=960 cm^3

Martin's Box is 4x15x16=960 cm^3

Bill is right. The boxes have the same volume
CRIDITS TO ARMANDA120

5 0

4 years ago