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Fiesta28 [93]
2 years ago
5

12. Alexa solves an equation using the steps below as her first three steps. Step 1: 3(x - 4) = x + 8 Step 2: 3x - 12 = x + 8 St

ep 3: 2x – 12 = 8 Which operation did Alexa use on both sides of the equation to go from Step 2 to Step 3? A subtracted 8 B subtracted x C added 2x D added 12​
Mathematics
2 answers:
Gnom [1K]2 years ago
7 0

Answer:

b) She subtracted x from both sides

Step-by-step explanation:

Step 1: 3(x - 4) = x + 8

Step 2: 3x - 12 = x + 8

Step 3: 2x – 12 = 8

3(x - 4) = x + 8

3x - 12 = x + 8

- x        - x (here, she subtracted x from both sides)

2x - 12 = 8

Hope this helps!

Nitella [24]2 years ago
5 0

Answer:

B. Subtracted x

Step-by-step explanation:

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Lucy bought a microwave oven at 70% off the original price. If she paid $21,
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Answer:

the answer is 49

Step-by-step explanation:

70-21=49

21-70=49

49%70=21

49%21=70

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horrorfan [7]

Answer:

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(-26) – 14.<br> Need help pls
prohojiy [21]

Answer:

-40

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and REMEMBER its negative, so we add the negative sign. -40

Step-by-step explanation:

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3 years ago
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1000 households were surveyed. 275 households own a desktop computer, 455 households own a DVD player, 405 households own two ca
icang [17]

Answer:

Step-by-step explanation:

From the given information,

Suppose

X represents the Desktop computer

Y represents the DVD Player

Z represents the Two Cars

Given that:

n(X)=275

n(Y)=455

n(Z)=405

n(XUY)=145

n(YUZ)=195

n(XUZ)=110

n((XUYUZ))=265

n(X ∩ Y ∩ Z) = 1000-265

n(X ∩ Y ∩ Z) = 735

n(X ∪ Y) = n(X)+n(Y)−n(X ∩ Y)

145 = 275+455 - n(X ∩ Y)

n(X ∩ Y) = 585

n(Y ∪ Z) = n(Y) + n(Z) − n(Y ∩ Z)

195 = 455+405-n(Y ∩ Z)

n(Y ∩ Z) = 665

n(X ∪ Z) = n(X) + n(Z) − n(X ∩ Z)

110 = 275+405-n(X ∩ Z)

n(X ∩ Z) = 570

a. n(X ∪ Y ∪ Z) = n(X) + n(Y) + n(Z) − n(X ∩ Y) − n(Y ∩ Z) − n(X ∩ Z) + n(X ∩ Y ∩ Z)

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n(X ∪ Y ∪ Z) = 50

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n(X ∪ Y ∪ C') = 95

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Answer:

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Step-by-step explanation:

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