Shell charges $2.23 dollars per gallon of gas for refueling vehicles. assume the number of gallons is your independent variable (x) and the cost is your dependent variably (y). find 'y', the cost of x gallons of gas.

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

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.