Answer: 2x-3=15
2(9)-3=15
18-3=15

Recall that


Your sums start at
, so in order to apply these formulas directly, you need to compensate for the missing first two terms:



Answer: C
Step-by-step explanation:
Answer:
I'd need to see more, but because they are the same number just positive and negative they'd be on opposite ends of zero
Answer:
158 ribbons even half of one still counts.
Step-by-step explanation: