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Write a function rule in each case and then evaluate the function rule.
1. Alan is 3 years younger than 2 times his brother age. Write a rule that represents Alan’s age a
as a function of his brother’s age b . How old is Alan if his brother is 11?
2. A taxi cab charges $3 for the first mile and $1.5 for each additional mile. Write a rule for
describing the total rate r as a function of miles m . What is the taxi rate for 16 miles?
