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elena-s [515]
3 years ago
9

Please someone can help me with #13, 15 and 16 Thanks.

Mathematics
1 answer:
ladessa [460]3 years ago
8 0
What's the question though?
You might be interested in
Solve for x: 3(x + 1) = −2(x − 1) − 4.
Vlad [161]

Answer:

Multiply the first bracket by 3

Multiply the second bracket by -2

3x+3=-2x+2-4

3x+2x+3=-2x-2   negative (-) number and positive number (+)= negative number

Just rearranging

5x+3=-2

5x+3-3=-2-3

5x=-5

Dividing by 5

5x/5=-5/5

x=-1

Check answer by using substitution method

3(-1+1)=-2(-1-1)-4

0=-2(-2)-4 negative number and negative number = positive number

0=4-4

0=0

Answer is x=-1

6 0
3 years ago
Sara is serving wings and burgers at her party. Wings cost $6.00 per serving and burgers are $3.00 each. Sara knows that at leas
katrin2010 [14]

Answer:

A) (5,4)

Step-by-step explanation:

Just take a look at the intersection in the dark blue area. The only point that fits in that area is A) (5,4). And this makes sense, but let's check it anyways:

5 wing + 4 burger < 45

5(6) + 4(3) < 45

42 < 45. If she bought one more burger, she would be at $45, and the problem asked us to be under $45, so this is our answer.

3 0
3 years ago
Read 2 more answers
Which statement is true? A matrix separates rational and irrational numbers. A matrix separates positive and negative numbers. A
Jet001 [13]
I'm pretty sure the answer is "A matrix separates rational and irrational numbers." (Note: I'm not that great with memorizing definitions, but I'm pretty sure.) Hope this helps :)
5 0
3 years ago
Find the range of the data set: 7, 12, 15, 4, 23, 15, 25, 9<br> A. 4<br> B. 9<br> C. 19<br> D. 21
UkoKoshka [18]

Answer: 21 is your range

hope this helps

Step-by-step explanation:

To find the range, subtract the smallest number in the set from the largest

4 0
2 years ago
Read 2 more answers
If the area of a circle is 81π, then what is the diameter of the circle?​
viva [34]

Answer:

18

Step-by-step explanation:

81π=πr^2

r= 9,-9

9+9=18

7 0
3 years ago
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