Section 1

Variables in mtcars:

mpg - Miles per gallon of the vehicle
cyl - How many cylinders the vehicle has
dis - Displacement of Vehicle
hp - Horsepower of vehicle
drat - Rear axle ratio
wt - Vehicle weight
qsec - 1/4 sec mile time
vs - Engine type (v or straight/inline)
am - Transmission type
gear - Number of gears
carb - Number of carburetors

Section 2

\[mpg = \frac{miles\;traveled}{gallons\;of\;gas}\]

Section 3