you are planning a field trip for your class. you have two options: option a is to visit to a science museum, which costs $10 per student plus $200 bus rental fee. option b is a trip to a local park, which costs $5 per student plus a $150 bus rental fee. write an equation to represent the total cost (c) of each option based on the number of students (s) attending the trip. determine the number of students for which each option would be more cost-effective.