Answer:
Your answer is 29.
Step-by-step explanation:
pythagorean theorem: a^2+b^2=c^2
equation: 20^2+ 21^2=x^2
next, simplify it to 400+441=x^2 and you would get 841.
now we must find the square root of 841 to get 29
196 miles
if he goes 140 miles with 5 gallons, each gallon lets him go 28 miles.
140miles/5gallons=28miles/1gallon
then 7 gallons lets you go 196 miles
brainliest please :)
