3x - 10 + x = 90
4x = 100
x = 25 degrees
He divided the wrong way. 7/33 = .2121.....and 2/11 = .1818...., so actually 2/11 < 7/33
Answer and Step-by-step explanation:
If my calculations are correct,
A. 17b = w
B. 867 = w
C. 3 bottles for 51 fluid ounces of water
For B and C, just plug in the values.
For A, it was 17 ounces for every bottle (b), so that's why it is multiplied together. This is then equal to w, the total volume of water in fluid ounces.
Looks like the series is supposed to be

The series telescopes; consider the
th partial sum of the series,



As
, the second term converges to 0, leaving us with
