Answer:
c
Step-by-step explanation:
0.72
- .20
------------
0.52 (.20 is two tenths)
To find the annual rate of chnge, we have to use the following formula

P(2010) represents the population in the year 2010 and P(2000) represents the population in the year 2000 .
Substituting the values, we will get

Gemma gets 6 Biscuits and Zak gets 24 Biscuits.
77 - 2 = 75
75 ÷ 5 = 15
The number is 15.
Hope this helped!