What is the value of the mode when all values in the data set are different? (a) One (b) Zero (c) There is no mode (d) It cannot be determined unless the data set is given

I’m stuck on this i don’t understand.

Fiona joins a fruit of the month club. the entry cost was $25 and then she pays $18 per month. if she participates for 8 months, how much will she pay in all? how much in 10 months?

Which zero pair could be added to the function f(x) = x2 + 12x + 6 so that the function can be written in vertex form? o 3, -3o 6,629,-936, 36