B 9x+10, this is because you just simply combine like terms
-4x+3 and -2y idk if that's completely right tho
No "x" can not be repeated, a function has one x-element and one y-element
The population in the above situation is the total number of students under Mr. Wilson.
A sample is a part of the population that may best represent the population. There is no sample in the above situation because Mr. Wilson made all students pick 5 note cards. He will be able to determine the performance of each student based on their performance in picking 5 note cards and defining the terms in each card.
