How many permutations of costume contain "come" as a substring? how about as a subsequence (meaning the letters of "come" have to appear in that order, but not necessarily next to each other)?

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90