Suppose that a car rental agency charges a fixed amount per day plus an amount per mile for renting a car. Heidi rented a car one day and paid $50.00 for 100 miles. On another day she rented a car from the same agency and paid $120.00 for 450 miles. Determine the linear function that the agency could use to determine its daily rental charges.
A. f( x ) = 0.4x - 30
B. f( x ) = 0.4x + 30
C. f( x ) = -0.2x + 30
D. f( x ) = 0.2x - 30
E. f( x ) = 0.2x + 30
Answer: E
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