Which of the following graphs represents a proportional relationship?

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

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The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)