700. To find out what number a value is ten times as much as, divide by 10.
Answer:
a
Step-by-step explanation:
Answer:
84
Step-by-step explanation:
2^2=4
4+8=12
12*7=84
10 days is twice the half-life. After 5 days, can expect

grams to remain; after another 5 days, you'd be left with

grams.
The answer is A because the same rule applies