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3 years ago

Solve 6b<24 or 4b+12>4

Mathematics

1 answer:

Montano1993 [528]3 years ago

6 0

B<4 or b>-2
Hope this helped please give brainliest

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Find the coordinates of B' after a reflection across the x-axis. show your work

bazaltina [42]

Answer:

B'(8, 6)

Step-by-step explanation:

Coordinates of point B = (8, -6)

<u>Reflection across the x-axis results in:</u>

(x, y) → (x, -y)

<u>Coordinates of B'</u>

(8, -6) → (8, -(-6)) = (8, 6)

8 0

3 years ago

SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Fin

Tomtit [17]

Answer:

Mean: 40.17 years.

Standard deviation: 10.97 years.

Step-by-step explanation:

The frequency distribution is in the attached image.

We can calculate the mean adding the multiplication of midpoints of each class and frequency, and dividing by the sample size.

The midpoints of a class is calculated as the average of the bounds of the class.

Then, the mean can be written as:

$E(X)=\dfrac{1}{N}\sum f_iX_i\\\\\\E(X)=\dfrac{1}{60}(3\cdot15+7\cdot25+18\cdot35+20\cdot45+12\cdot 55)=\dfrac{45+175+630+900+660}{60}\\\\\\E(X)=\dfrac{2,410}{60}=40.17$

The standard deviation can be calculated as:

$s=\sqrt{\dfrac{1}{N-1}\sum f_i(X_i-E(X))^2}\\\\\\s=\sqrt{\dfrac{1}{59}[3(15-40.17)^2+7(25-40.17)^2+18(35-40.17)^2+20(45-40.17)^2+12(55-40.17)^2]}$

$\\\\\\s=\sqrt{\dfrac{1}{59}( 1,900.59 + 1,610.90 + 481.12 + 466.58 + 2,639.15 )}\\\\\\s=\sqrt{\dfrac{ 7,098.33 }{59}}=\sqrt{120}=10.97$

4 0

3 years ago

Find 8.5 times the difference between 77 and 13

Anton [14]

Answer:

544

Step-by-step explanation:

The statement 8.5 times the difference between 77 and 13 can be expressed mathematically as 8.5×(77-13)

According to BODMAS, we will deal with the expression in the bracket first to have;

8.5×64

Then we the product of the resulting expression.

8.5×64

= 544

The answer is 544

4 0

3 years ago

AS ALWAYS, DUE TODAY! Pls and thanks. NOTE- Legit answers only! Legit answers= Brainliest, 5.0 stars, and a Thanks. NOTE 2- Dist

olganol [36]

Answer:

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

At Ole's Waffle Shop there are 81 dirty coffee mugs and 9 clean coffee mugs. What percentage of the coffee mugs at the waffle sh

Andrei [34K]

90 percent of the mugs are dirty

6 0

3 years ago