B. 31°, 43°, 106°
since all angles of a triangle add up to 180°, you combine all of the equations to equal 180 and solve for X. the equation you would get it 3x+1+11x-4+5x-7=180. this simplifies to 19x-10=180. then you solve for x, and it is 10. then, you plug 10 into all of the equations separately to find the angles. therefore, the answer is B
Hope this helps, although, if you don't understand something, tell me!
Answer:
$1200
Step-by-step explanation:
According to the question,
$500 for airline ticket plus $100 each day .
Therefore, a seven day vacation would cost you $500 for the airline ticket plus $100 times seven days .
That is $500 + ( $100 x 7)
$500 + $700
$1200
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