No it is not. It is a fraction
By the chain rule,


We also have

,

, and

, so at this point we get
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.
The answer is :X^2 + 7x + 12
The mistake made was when expanding they added 3 and 4 together instead of multiplying it
Answer:
19.64°
Step-by-step explanation:
The angle of elevation can be calculated as follows
Tan ©= 15/42
= 0.357
= tan-1 0.357
= 19.64°
Hence the angle of elevation is 19.64°