algebra
posted by lee .
could someone check these answer please?
solve the following proportion for x.
x/8=5/3=0
rueben drove 300 miles using 14 gallons of gas, at this rate, how many gallons would he need to drive 210?= 40.3 gallons
solve for v; v^2+v30=0=v=6,5
thanks

first one:
x/8 = 5/3
3x = 40
x = 40/3
Your second answer should have appeared illogical to you.
If he uses 14 gal to go 300 miles, how could he use about 3 times that much to go only 210 miles
300/14 = 210/x
300x = 14x210
x = 14x210/300 = 9.8 gallons
third is correct 
Thanks again Reiny!!