A keyboard that costs $475 is marked down 15% for a sale. What is the reduced price of the keyboard?

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

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute