Answer:
33 ft
Step-by-step explanation:
hey, hope this helps and right.
Am not sure but i think it would be A
X=17+(sqrt(2y)/2),x=17-(sqrt(2y)/2) i believe is the answer
The mean of n numbers is the sum of the numbers divided by n.
You have a mean score of 84 after taking 5 tests. Let x be the sum of scores.

You scored a total of 420 points on five tests.
You need to have a mean score of 85 after taking 6 tests. Let y be the score you need to obtain. Your total score on 6 tests is 420+y.

You need to score 90 points on the sixth test.
7x²-14x=0
7x²=-14x
sry idk the rest hope this helped a little bit