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➷ 3.5 + x = 7
We need to isolate x
Subtract 3.5 from both sides:
x = 3.5
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C= 3b + 2d
Subtract 3b first.
C-3b = 2d
Divide by 2.
C-3b/2 = d
OR
C-3b
-------- = d Your final answer!
2
2.96 or 18.75 is the answer im leaning towards 2.96 though
Set up a proportion:

=

To solve cross multiply:
3000x=300000
divide both sides by 3000:
3000x/3000=300000/3000
x=100
It will take her 100 hours to drive 4000 miles assuming she continues to travel at this rate.