More than eighteen students in an algebra class pass the first test . This is about three fifths of the class . How many students are in the class?

Which of the following graphs represents the function f(x) = 2^x

How do you solve a question like this?

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?