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Sergio039 [100]
4 years ago
7

3+ (-9).Should you add or subtract 3 and 9? Why?​

Mathematics
2 answers:
marta [7]4 years ago
8 0

You subtract because it's just adding a negative which cancels out the adding and makes it a subtraction problem.

sattari [20]4 years ago
6 0

Answer:add positive 3 to the (-9) which will be (-6)

Step-by-step explanation:

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The width of a rectangle is 9 less than the length. If the perimeter is 130 cm, find the length and the width of the rectangle.
pochemuha

<u>Answer</u>

B. Length = 37, width = 28


<u>Explanation</u>

Let the length of the rectangle be x,

width is 9 less. So, width = x - 9

Perimeter of a rectangle = 2(length + width)

2(length + width) = 130

2(x + x - 9) = 130

2(2x - 9) = 130

4x - 18 = 130

4x = 130 + 18

4x = 148

x = 148/4

  = 37

<em>Length = 37</em>

<em>Width = 37 - 9 = 28</em>

5 0
3 years ago
Teachers are being trained to standardized the scores they give to students' essays. The same essay was scored by 10 different t
evablogger [386]
What do you want solved?
5 0
3 years ago
WILL GIVE BRANLIEST! pls help thank you!
Gwar [14]

Answer:

x^2 + 10x - 9

Step-by-step explanation:

(1+2)3 = 1(x(x+10))

3 0
3 years ago
Travis has hired Charlie and Dora to plant flowers. Dora can plant 150 flowers in the same time it takes Charlie to plant 120 fl
slega [8]

Answer:

  72

Step-by-step explanation:

If the rates d and c are flowers per day, we have ...

  150/d = 120/c

  d -c = 18

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Multiplying the first equation by cd/30, we have ...

  5c = 4d

Multiplying the second equation by 4 gives ...

  4d -4c = 72

Adding these equations together, we get ...

  5c +4d -4c = 4d +72

Simplifying and subtracting 4d leaves ...

  c = 72

Charlie can plant 72 flowers per day.

4 0
3 years ago
What are the solutions of the quadratic equation?<br> 5x^2+51x+54 = 0
pentagon [3]
X = - 6/5 or x=-9 !!!!!!!!!!!!!
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