Find the value of given expression

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Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot