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algebra

posted by on .

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+v-30=0=v=-6,5
thanks

  • algebra - ,

    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

  • algebra - ,

    Thanks again Reiny!!

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