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NARA [144]
4 years ago
14

PLEASE HELP!! BRAINLIST

Mathematics
1 answer:
Ratling [72]4 years ago
8 0

Answer:

19. 4^9=262144

20. 349524

Step-by-step explanation:

Each week, the number of new cases is equal to 4^n, for the 9th week, this is equal to 4^9=262144.

The number of total cases each week is a geometric series. The sum of the first n terms of a geometric series with common ratio r and first term a is

a(1-r^n)/(1-r). Using this, 4(1-4^9)/(1-4)=349524.

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