Answer:

Step-by-step explanation:
Let us apply the distributive property to find an equivalent expression for:

For all real numbers a, b, and c, the distributive property says that:

We apply this property to get:


We simplify the RHS to get:

21+9+21+9=Perimeter of the pool = 60
And Carlos did this 7 times (x)...60 x 7 = 420
Step-by-step explanation:
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Answer:
a
Step-by-step explanation:
Well, what you need to figure out is what times 9 is 63. That would be 7. So n=7 :)