Answer:
280 miles
Step-by-step explanation:
Divide 420 by 12 to find the unit rate of miles per gallon.
You get 35 miles per gallon
To find how many miles he can travel for 8 gallons, multiply 35 by 8.
You get 280 miles.
There're a lot of many irrational that meet the requirement. For example:

where
and 
represent irrational numbers
Cancel

out to get
11/7

where

is known as irrational number. As a result, these are some examples of how <span>an irrational number times another irrational number to get rational. Hope it help!</span>
(x-6)(x+2)=0
x-6=0, x=6
x+2=0, x=-2
least -2, greatest 6
Answer:
3/5 y +9/10 z
Step-by-step explanation:
4/5 y + 7/10 z - 1/5 y + 1/5 z
4/5 y - 1/5 y + 7/10 z + 1/5 z
We need to get a common denominator for the z term of 10
4/5 y - 1/5 y + 7/10 z + 1/5 *2/2 z
4/5 y - 1/5 y + 7/10 z + 2/10 z
3/5 y +9/10 z