9+(8+1)=(9+8)+1What property is this?

Associative Property of Addition

Step-by-step explanation:

Hey there! I will give you my reasons on why it is this answer, if you have any questions feel free to ask me in the comments below.

Question: 9 + (8 + 1) = (9 + 8 ) + 1 What property is this?

The answer to your problem would be the Associative Property of Addition. This is because it does not change the grouping of the addends, and it also does not change the sum. Good luck!

~I hope I helped you! :)~

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

the answer is 11.2 (i know i’m late)