3 attempts remaining. 150 moths lived in a lab. Each week, some moths died, and about 1/5 survived . How many moths were still alive after 2 weeks?

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?

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

Need this asap if anyone can i would be very grateful. if you could show workings that would really