Answer:B
Step-by-step explanation:
The half life is 138 days, meaning exactly half of the material will decay after this time. Use this information to find the decay factor
:

Then after 250 days, there will be

grams left.
Answer:
108
Step-by-step explanation:
36 inches in a yard
Answer:
Use a graphing calc or desmos to help guide you.
Step-by-step explanation:
Answer:
C. each result is equally likely to occur
Step-by-step explanation:
there's a 50% chance it'll either be heads or tails because there is only two probable options - heads or tails.