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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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The answer is v= -8x/-xy+9

Here is the step by step process (This is going to be long):

1.  9v+8x=vxy

Multiply both sides by vx

2.  9v+8x+−vxy=vxy+−vxy

−vxy+9v+8x=0

Add -vxy to both sides

3.  −vxy+9v+8x+−8x=0+−8x

−vxy+9v=−8x

Add -8x to both sides

4.  v(−xy+9)=−8x

Factor out the variable v

5.  v(-xy+9)/-xy+9 = -8x/-xy+9

v = -8x/-xy+9

Divide both sides by -xy+9

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3 years ago
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