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supose y varies directly as x and y=98 when x=14. write a direct variation equation that relates x and y. then find y when x=-4

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.