4(20 + x)
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Let

. Then

Meanwhile, since

, you have

.
It follows that

,

, and

, so that the quadratic fit for

that satisfies the given points is

Note that this is just the second-order Taylor polynomial for

about

.
All ratios have to simplified because it’s easier for the person to find the difference when breaking it down into lowest terms!
Answer:
7 gallons were used for city driving.
Step-by-step explanation:
I am going to solve this question by a system of equations.
I am going to say that:
x is the number of gallons driven in the city.
y is the number of gallons driven in the highway.
19 gal of gas
This means that 
Carole's car averages 13.2 mi/gal in city driving and 25.3 mi/gal in highway driving. If she drove a total of 396.0 mi.
This means that 
How many of the gallons (to the nearest gallon) were used for city driving?
This is x
From the first equation, i will have

Replacing in the second equation






7 gallons were used for city driving.