It is this photo if it has been added
Answer:
Step-by-step explanation:
If you factor the expression 7a+21 you can get:
7 × (a+3)
So... if we take 22.8 to be the 100%, then it dropped to 12.1,
the difference in between being 22.8 - 12.1 or 10.7 decrease
so... what is 10.7 in percentage, of 22.8?
well

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