25% there are 8 sections and there are two you are trying to land on making it 2/8=25%
Hiya!
So, 6 billion is 100%. 50% is 3 billion. 25% is 1.5 billion. 20% must be 1.2 billion because 1.2 × 5 is 6. I know that 20% is 1/5 of 100%, and that's how I got my answer.
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Multiplying the whole function by -1 reflects the function across the x axis
so f(x) to -f(x) would be a reflection across the x axis
multiplying the whole function by a fraction is a vertical transformation, if you multiply by a value x, such that 0<x<1, then it is a vertical shrink, if x>1, then it is a vertical stretch
so like f(x) to 2f(x) is a vertical stretch by a factor of 2
adding a value to the whole function moves it up by that number
ok
so

we have multiplied the whole thing by -1 and 1/2 and then added 2 to the whole function
that is a reflection across the x axis, a vertical shrink by a factor of 1/2, and translated up by 2 units in that order
The geometric mean is defined as the nth root of the product of n numbers
1. 4 and 9
Geometric mean = 
2. 5 and 8
Geometric mean = 
3. 8 and 32
Geometric mean = 
4. 64 and 36
Geometric mean = 
Hope that helped!