Answer:
Step-by-step explanation:
Option D should be the right answer
Yeah because he was at least 80% and when you add the grain and carbon that was total. Then divide the carbon. It will be 80%
Answer:
Square: 
Vertex: (10,-68)
Step-by-step explanation:
Undefined (not a real number)
The square root of -256 would result in an imaginary number so by terms, it's "not real". The imaginary number would be 16i. 16x 16 =256, but since it's negative, it's √16 √16i.