julia6161
julia6161 julia6161
  • 13-04-2020
  • Mathematics
contestada

PLEASE HELP!! BRAINLIST

PLEASE HELP BRAINLIST class=

Respuesta :

mobilegamingexpert
mobilegamingexpert mobilegamingexpert
  • 13-04-2020

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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