(HELP!) During her visit to zoo, lvy stops by the cafe and orders a chicken fajita taco and a juice. if she pays for her order with a 10.00 dollar bill, the chicken fajita taco cost 3.50 and the juice cost 1.80 how much change will she receive back? (also pls explain why your answer is correct.)

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000