Scale factor should be 20.
10 plus 20 is 30 (figure B) therefore 15 plus 20 should be 35
The associative property is:
A + B + C = A + (B + C) = (A + B) + C
And a option that uses this is:
-4i + i + 4i- i = (-4i + 4i) + (i - i)
<h3>
Which equation shows an example of the associative property of addition?</h3>
The associative property says that we can write:
A + B + C = A + (B + C) = (A + B) + C
So, we can perform the sum in any order we want to.
Then for the given case we would have:
-4i + i + 4i- i = (-4i + 4i) + (i - i)
Where we sum in the order we want to get it equal to zero.
If you want to learn more about sum properties:
brainly.com/question/115658
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Let x + 15 = total penguins
15/ (x +15) = .30
15 = .30x + 4.5
.30x = 10.5
x = 35
Total penguins = 15 + 35 = 50
Double Check
15 / 50 * 100 = 30% Correct!!!