To find the amount of miles/gallon, we have 540 miles/18 gallons=30 miles/gallon. As we add 30 miles for every gallon, the amount of miles traveled is 30*x (e.g. if x is 1 then 0+30=30 and if x is 2 then 30+30 (2 times)=60) with x being the amount of gallons. For b, we just plug 12 in for x to get 20*12=360
Step-by-step explanation:
Formula:
d×3.14=C
or
r×3.14×2=C
d=diameter
r=radius
Rhombus no right angles 2 pairs of parallel sides