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The difference is the result of a subtraction problem.
We are given two values that are being subtracted: 54 and a number, represented by 
So, represent this mathematically with
.
Then 70% of volcanos wouldn't be in California.
3 terms
when you combine like terms you are left with 10x + y + 8 which is 3 terms.
When ANY number is multiplied by its own reciprocal, the product is ' 1 '.
Rounded to the nearest thousandth
3n = 3 (0.333) = 0.999 = 1
-n/3 = -0.333/ 3 = -0.111
2n = 2(0.333) = 0.666 = 0.667