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gayaneshka [121]
2 years ago
14

I need this rn 3×-7 equivalent expressions A. -21 B. 4 C. -4 D. 21

Mathematics
2 answers:
Drupady [299]2 years ago
8 0

Answer: The answer is A. -21

Its simplified and i just multiplied 3 by -7 :)

Sindrei [870]2 years ago
7 0

Answer:

A

Step-by-step explanation:

because a plus and minus equals a minus.

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If a person measures 42in in height what does the person measure in feet. I got the answer correct which is 3ft 6in but I need t
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42in=42\cdot0.0833333ft=3.5ft\\\\Answetr\ is\ 3.5\ feet.
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3 years ago
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Explain each part of the slope-intercept equation: y = -3x + 5 <br> HELP PLS
yanalaym [24]
Y=mx+b

b represents your y-intercept
mx represents your slope
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2 years ago
HELP ASAP PLEAse!!! HOW DO YOU FIND THE LATERAL AREA OF THE TRIANGLE, (ALREADY GOT SURFACE AREA CORRECT), PLEASE ROUND IT TO THE
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172.9

You find it by multiplying each side of the triangle by the height (9) and adding the results together.

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6 0
1 year ago
How did the temperature change if: at first it decreased by 60% and then increased by 80%. PLEASE NEED HELP!
Sergio039 [100]

The temperature decreased by 28%

Step-by-step explanation:

How did the temperature change if :

  • At first it decreased by 60%
  • Then increased by 80%

Assume that the temperature before decreasing is 100%

∵ The temperature before decreasing = 100%

∵ It decreased by 60%

→  Before decreasing  :  decreasing  :    after decreasing

→  100%                         :  60%              :    100% - 60% = 40%

∴ The temperature after decreasing = 40%

Assume that the temperature after decreasing is 100%

∵ The temperature after decreasing = 100%

∵ It increased by 80%

By using the ratio method

→  After decreasing  :  increasing  :    after increasing

→  100%                      :  80%             :   100% + 80% = 180%

→  40%                        :                       :   x%

By using cross multiplication

∴ 100% × x% = 40% × 180%

- Divide both sides by 100%

∴ x% = \frac{(40)(180)}{100}

∴ x% = 72%

∵ At first the temperature = 100%

∵ At last the temperature = 72%

∵ The first the temperature > the last the temperature

∴ The decreasing in temperature = 100% - 72% = 28%

The temperature decreased by 28%

Learn more:

You can learn more about ratio in brainly.com/question/2707032

#LearnwithBrainly

5 0
3 years ago
Jason has $90 to spend. He wants to purchase a bag for $30, one eraser for $10, and three pencils. Each of the pencils costs the
snow_tiger [21]
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This equation shows that all the prices of the the bag, eraser, and pencils equals $90. So now all we have to do to find the price of a pencil is solve the equation.

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Then subtract 40 from each side

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The price per pencil is $16.67

Hope this helps!
4 0
3 years ago
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