What is the coefficient of the term 9y in the expression 5+9y

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?

The volume of a cube is 8 in to the 3rd power. how long is each side?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36