2/3 is left over
I hope this is the answer you are looking for.
The answer is: C - x^3 + 27
255.00 x 0.40 % = 102.00
102.00 +255.00 = 357.00 (original price of tv)
Since this is an arithmetic sequence, you can conclude that
the addition to the number is constant.
Let x = the number asked
k = constant
number added to the sequence
7 + k = x
x + k = 17
Solve the system of equation:
7 + k + k = 17
7 + 2k = 17
2k = 10
k = 5
Therefore, the missing number is 12 (7 + 5).