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4. Kara enlisted her friend Frannie to help shovel all the driveways in her grandma's condominium community. It takes Kara 40 minutes to shovel

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4. Kara enlisted her friend Frannie to help shovel all the driveways in her grandma's condominium community. It takes Kara 40 minutes to shovel a driveway and it takes Frannie 45 minutes to shovel the driveway. Write an equation for a function, d, that gives the number of driveways Kara and Frannie cam shovel by working together for hours.

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