Answer: 
Step-by-step explanation:
Given
Population of dust particle doubles every 30 minutes
If the initial sample is 21 grams
The model to predict the population will be

Where t=time in hours
A day has 24 hours . So, for 2 days time is 48 hours
Population is given by
Answer:
153.86.
Step-by-step explanation:
Formula for area of a circle: A= Pi R (R is radius) squared. First fill in the numbers: 3.14x7^2 Then Solve for the squared: 7^2=49, then finally multiply 49x3.14 which gets you to 153.86.
Answer:
9
Step-by-step explanation:
There would be 9 because 7 goes into 66 9 times
Answer:
3?
Step-by-step explanation:
I think it is 3, because...
33 - 17 = 16
16 - 4 = 12
12/4 = 3
???
Answer:
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