davis17 davis17
  • 19-05-2018
  • Mathematics
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Аноним Аноним
  • 19-05-2018
They used 8 gallons in travelling 175 miles 
average miles / gallon    = 175/8 = 21.88 

x^2 - 8x - 13 = 0

(x - 4)^2 - 16 = 13

(x- 4)^2 = 29
x - 4 =  +/- sqrt29
x = 4 + sqrt29  and 4 - sqrt29

Its A

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