This is the number of combinations of 2 from 23
23C2 = 23! / 2! 21!
A quick way to do this is 23*22 / 2 = 253
Answer:
3
Step-by-step explanation:
A + 12.5 = 20
- 12.5 -12.5
———————
A = 7.5
The answer is 7.5
Answer: it's not D i thought it was and I got it WRONG!!!