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3 years ago

GIVING BRAINLEST!

Mathematics

1 answer:

irina [24]3 years ago

7 0

Answer:

the 5th month

Step-by-step explanation:

Triax=

1st month $50 phone+ $40fee = $90 first month

2nd month= $90+$40=$130

3rd month= $170 (I think you caught on tp the add $40 each month)

4th month= $210

5th month=$250

CellUR=

1st month = $50

2nd month = $50+$50=$100

3rd month = $150(I think you caught on tp the add $50 each month)

4th month= $200

5th month=$250

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A.
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B.
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Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.

The correct solution:
$3(2x-4)=5x-1 \ \ \ \ \ \ \ \ \ \ \ |\hbox{expand the bracket} \\
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x-12=-1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 12 to both sides} \\
x=11$

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