1. a school has 10 classes with the same number of students in each class. one day, the weather was bad and many students were absent. 5 classes were half full, 3 classes were 3/4 full and 2 classes were 1/8 empty. a total of 70 students were absent. how many students are in this school when no students are absent?
2. a telephone company charges initially $0.50 and then $0.11 for every minute. write an expression that gives the cost of a call that lasts n minutes.