Please help, explain if possible

If 3a+4a=14, and b+6b=21, then 7(a+b) =<br><br> Help and show work!

den301095 [7]

Hello!

You have to find what a and b are

3a + 4a = 14
b + 6b = 21

Lets do a first

3a + 4a = 14

Combine like terms

7a = 14

Divide both sides by 7

a = 2

Now lets do b

b + 6b = 21

Combine like terms

7b = 21

Divide both sides by 7

b = 3

Put a and b into the third equation

7( 2 + 3) =

Do what is in parenthesis first

7(5) =

Multiply

35

The answer is 35

Hope this helps!

8 0

3 years ago

Read 2 more answers

3. There are 350 people in an office building. A local deli randomly surveyed people in the building to determine the average am

IrinaK [193]

Answer:

(a)Sample 1

The Mean = 20

The median = 25

Sample 2

The Mean = 31

The median = 60

(b) Sample 1 has the least spread

Sample 1 has the least deviations from the mean

(c) Sample 1 align with the third sample

The least representative of the population is sample 1

Step-by-step explanation:

The mean is ∑fx/∑f

∑fx = 30 + 25 + 10 + 25 + 10 = 100

∑f = 5

Mean = 100/5 = 20

For the median, we arrange the data in increasing order;

10, 10, 25, 25, 30

The median = the middle number = 25

Sample 2

The mean is ∑fx/∑f

∑fx = 5 + 60 + 10 + 30 + 50 = 155

∑f = 5

Mean = 155/5 = 31

For the median, we arrange the data in increasing order;

5, 10, 30, 50, 60

The median = the middle number = 30

(b) Sample 1 range =$30 -$10 = $20

Sample 2 range =$65 -$5 = $60

Sample 1 has the least spread

Sample 1 standard deviation = 9.354

Sample 2 standard deviation =24.083

Sample 1 has the least deviations from the mean

(c) $30, $25, $20, $20, $25

Mean = 24

$20, $20, $25, $25, $30

Median = $25

∑fx = 120

Therefore sample 1 align with the third sample

The least representative of the population is sample 1 with ∑fx = 100.

5 0

3 years ago

Which number is a reasonable estimate for 553 +363?<br> A 1,300<br> B 1,000<br> 600<br> D 200

Flura [38]

its b because you can round 363 to 400 and 553 to 600 400 + 600 = 1000

7 0

4 years ago

Read 2 more answers

Can someone please help me with this⁉️ the math question is in the picture and I’m so confused.

Mice21 [21]

Answer:

i dont C a pic

Step-by-step explanation:

lol xd

7 0

3 years ago

No spam or leaks

g100num [7]

The slope of the line representing the linear graph is a rate of 3.2 meters per second.

<h3 /><h3>Linear equation</h3>

A linear equation is in the form:

y = mx + b

where y, x are variables, m is the slope of the line and m is the y intercept.

Let y represent the distance in meters and x represent the time in seconds. Hence:

Using the points (20, 64) and (60, 192)

$Slope = \frac{y_2-y_1}{x_2-x_1} =\frac{192-64}{60-20} =3.2$

The slope of the line representing the linear graph is a rate of 3.2 meters per second.

Find out more on linear equation at: brainly.com/question/14323743

5 0

3 years ago