Triangle abc is similar to triangle xyz. which proportion can be used to find the measure of the missing side?

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?

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

If you could answer these your a life saver