6. write equations of the following scenarios in any form
a) a taxi charges a flat fee of $3.50 plus $0.25 per mile.
b) a movie theatre sold $8 child tickets and $12 adult
tickets. they made a total of $400.
c) a writer charges $2 per word plus a start-up fee. if he
writes 1000 words, the writer charges a total of $2350.
d) an airplane is currently at a height of 34,000 feet high.
after 3 minutes, the airplane is now at an elevation of
22,000 feet.