On a cross-country trip, a car uses 5 gallons of gas for every 120 miles it travels. How many
gallons of gas does the car use if it travels 600 miles? How far can the car travel if it uses 30 gallons of gas?

The car uses gallons of gas if it travels 600 miles.

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*