Translate the sentence into an equationTwice the difference of a number and 2 equals 8

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Heather is a cashier. she can ring up 1212 customers in 99 minutes. at this rate, how many minutes does it take her to ring up 44 customers?

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?