Answer:
<h3>

</h3>
Step-by-step explanation:

Distribute 6 through the parentheses

Add the numbers

Move constant to right hand side and change it's sign

Calculate

Divide both sides of the equation by -6

Calculate

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15.) 12a^11y^12/4a^5y^8
=12a^6y^4/4
=3a^6, y^4
16.)(2p^10z)^3
=8p^30 z^3
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-4827.7
So we see 12.3- 60.5xy and x is 20 and y is 4.
So we substitute the x and y in.
12.3 - 60.5*(20)*(4)
Then we solve, we times first.
12.3 - 4840
Then we subtract, so it would be:
-4827.7