You idiot you answered your own question!
I believe it is commutative property cause the numbers didn't change instead they just switched places in the equation.
Step-by-step explanation:
To find the mean absolute deviation of the data, start by finding the mean of the data set. Find the sum of the data values, and divide the sum by the number of data values. Find the absolute value of the difference between each data value and the mean: |data value – mean|.
Answer:
3.5ft
Step-by-step explanation:
Hi there!

Work out the parenthesis.

Combine like terms.

Subtract 9 from both sides.

Subtract 4x from both sides

Divide both sides by -9