After driving 378 miles, they have used 14 gallons of gas. They have 243 miles left to drive on the trip. How much gas will they need to finish the trip?

9 gallon of gas

Step-by-step explanation:

When distance covered is 378 miles, they have used 14 gallons of gas

We need to find how much gas will they need to finish the trip if 243 miles left to drive on the trip.

378 miles = 14 gallons of gas

For 1 mile,

1 gallon of gas is used for

For 243 miles,

Hence, for 243 miles 9 gallon of gas is used.

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0

i think its 7.6

if so your welcome