Ill mark brainlist plss help

81 mi^2

Step-by-step explanation:

A square has 4 equal sides... area is calculated with lengthxwidth

9x9 = 81

true statements:

a) x + y = y + x   ⇒ commutative property of addition

b) (x * y) * z = x * (y * z) ⇒ associative property of multiplication

d) (x + y) + z = x + (y + z) ⇒ associative property of addition

false statements:

c) x - y = y - x   should be: x - y = - y + x

e) (x - y) - z = x - (y - z) should be: (x - y) - z = x - (y + z)

step-by-step explanation:

h/o/e/s mad

step-by-step explanation:

si si si