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3 years ago

Simplify 2( x - 3) + 7( x + 2). A. 9 x - 8 B. 9 x + 3 C. 9 x + 8

Mathematics

2 answers:

kupik [55]3 years ago

8 0

Answer: C. 9x + 8

Step-by-step explanation: Multiplied out, this is the long simplified answer:

2x - 6 + 7x + 14.

Add like terms together and you end up with:

9x + 8.

So your answer would be C.

Lynna [10]3 years ago

3 0

Answer:

Your answer should be C. 9x + 8.

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Find the area of the rectangle. (8x + 5) yards (8x - 5) yards

Zepler [3.9K]

Answer:

48x-5

Step-by-step explanation:

multiply

5*8x

to get

8x+40x-5

combine like term

48x-5

7 0

2 years ago

A collection of 5 positive integers has mean 4.4, unique mode 3 and median 4. If an 8 is added to the collection, what is the ne

Sphinxa [80]

9514 1404 393

Answer:

4.5

Step-by-step explanation:

It appears the 5 integers must be {3, 3, 4, 5, 7}.

For the mode to be unique, there must be more than one '3', and there cannot be any other repeated numbers. For 4 to be the median, it must be the 3rd-highest number. Then the remaining numbers must be integers greater than 4 with a sum of 12 for the mean to be 4.4.

When 8 is added to the collection, the median is now the average of 4 and 5, so is 4.5.

The new median is 4.5.

_____

Comment on vocabulary

mean: the sum of numbers divided by the number of numbers. 5 numbers with a mean of 4.4 will have a sum of 5×4.4 = 22.

median: the middle number of a collection of an odd number of numbers, when sorted from lowest to highest. It is the 3rd number of a group of 5 numbers. When there are an even number of numbers in the group, the median is the average of the middle two in the sorted list. Here, that means the 3rd number in the list of 5 is '4'. When 8 is added, 4 becomes one of the numbers contributing to the average that will be the new median.

mode: the member of the group that appears the most times. When the mode is unique, it means there are no other numbers repeated as often. Here, we know the 3rd number (of 5) is 4, so there can only be two numbers '3' in the collection. That 3 is the unique mode means no other numbers are repeated at all.

8 0

3 years ago

What is the sum of 2x2 + 6x + 5 and 3x2 – 2x – 1?

Kipish [7]

5x2 + 4x + 4

Hope this helps!!!!!

Brainliest plzzzzz

3 0

3 years ago

The ratio of boys to girls in a school is 5:4. if there are 180 students, how many girls are there?

vladimir2022 [97]

Salutations!

The ratio of boys to girls in a school is 5:4. if there are 180 students, how many girls are there?

Let the number of girls and boys be 'x'.

 $5x + 4x = 180$

Add 5 and 4

 $9x = 180$

 $x = 20$

Now, multiply the ratios by 20.

Boys = 20 × 5 = 100

Girls = 20 × 4 = 80.

There were 80 girls.

Hope I helped (:

Have a great day!

4 0

3 years ago

Answer two questions about Systems A and B:

jeka57 [31]

Answer:

-Swap the order of the equations

-Yes

Step-by-step explanation: I just guessed

3 0

2 years ago