USE THE NUMBER 78 AND 34 TO WRITE AN EQUATION THAT SHOWS THE COMMUTATIVE PROPERTY OF ADDITION.?
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Combine like terms.
Since 7x and 6x both have a variable of x, you can combine them.
After that, you are left with:
You also have two numbers without variables; 11 and 3. You can also combine those.
So, your final answer would be:
1156-361=795
795=x^2
take the square root of both sides
x=abt 28.2