5/8 would be the simplest form for 10/16 .
The answer is B, two cups of milk for every 8 cups of bread.
This is because when using a recipe you want to make sure to get the proportions right and the ratio of milk to bread is 2:8
(4.2*105)+(5.3*10^5)
441 + 530000
530441
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If your problem is (4.2*10^5)+(5.3*10^5), it would be
420000 + 530000
950000
I am assuming you meant to write f(x) = 3^x -2
f(3) = 3^3 - 2 <=>
f(3) = 27 - 2 <=>
f(3) = 25
