MATHEMATICS MIDDLE SCHOOL

Solve for r:

-5 = 7 + 3r

Answers

Answer 1
Answer: So,

-5 = 7 + 3r
(subtract 7 from both sides)
-12 = 3r
(divide both sides by 3)
-4 = r
Answer 2
Answer: -5=7+3r\ \ \ \ \ \ |combine\ like\ terms\n\n-5-7=3r\n\n-12=3r\ \ \ \ \ \ \ |:3\n\nr=-4

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Which equation demonstrates the opposite of a sum property? A. (22 + 10) + 3 = (10 + 22) + 3 B. –5 + 13 = 13 + (–5) C. (12 + (–4)) + 14 = 12 + ((–4) + 14) D. –(–6 + 17) = 6 + (–17)

Answers

For all real numbers a and b,
-(a+b)=(-a)+(-b)
The opposite of a sum of real numbers is equal to the sum of the opposites 

D.
–(–6 + 17) = 6 + (–17)

Which strategy would you use to find 2+8 explain how you decided

Answers

In this problem we need to make the following addition:

2 + 8

According to this I would use the following strategy:

1. Break apart strategy:


This strategy consists in the decomposition or separation of numbers. In this way, we may break number 2 and 8 down to place value and add each, starting with the 8 or keep one number intact and only break second number down by place value and adding each place. Anyway, using this strategy we have:

2 + 8 = ?

Thus, 2 breaks into 1 plus 1 (1 + 1), 8 breaks into 4 plus 4 (4 + 4), so by associative property:

(1+4)+(1+4) = 5+5=\boxed{10}


2. Explain how I decided.


The strategy of breaking apart numbers is an easy way to find additions. This strategy is amazing to add larger numbers. Therefore, we may break larger numbers up into hundreds, tens, ones, then add them.
You would use the addition strategy.

This is because there is a plus sign, which signifies addition. So, 2 + 8 = 10. If there had been a minus sign (-), you would be subtracting. Additionally, if there was a multiplication (x) or division (/) sign, you would multiply or divide, respectively. 

Which is the best description of the transformation shown? A. A pentagon is reflected across the x- axis. B. A pentagon is reflected across the y- axis. C. A pentagon is translated 4 units down. D. A pentagon is translated 8 units down.             i think B?

Answers

The answer is B.the reason i think this is because I looked at the picture and the pentagons were lined up the same.

What expressions are equivalent to 3(n+6)

Answers

3n+3*6 which simplifies to 3n+18

Yadier killed 3 4/5 miles from the Nature Center to the waterfall. Then he hiked another 2 2/3 miles to Overlook Point. How far did Yadier hike from the Nature Center ? Give an estimate and the exact answer.

Answers

Answer: estimate 7

exact: 6 7/15

Step-by-step explanation: for the estimate round 3 4/5 to 4 and 2 2/3 to 3 and 4 + 3 = 7

for the exact number convert 3 4/5 to 3 12/15

and convert 2 2/3 to 2 10 /15

then add 3 + 2 = 5

and 12/15 + 10/15 = 22/15

convert 22/15 to a mixed number which is 1 7/15

then 5 + 1 7/15

answer 6 7/15

hope this helps mark me brainliest if it helped

the length of the rectangular classroom floor is 19 feet less than twice the width write an expression to represent the area of the floor

Answers

-19ft - 2w
this is the answer i souppose
9 length long there you go
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