So 9% of 13 is 1.17
so then you go $13 - $1.17 and your answer is $11.83
8, 8, 8, 8, 8, 9, 9, 9, 9 would work as a sequence.
Median: 8
Mean: 8.4444....
A) multiply both sides by 21 so x=7
B) multiply both sides by x, then both sides by 84, then divide both sides by 150 so x=14
The average of 6 quiz scores, where
is the score of the last quiz, is

The student needs a minimum average of 86 to earn an A:

so the student needs a score of 91.