Enrico is laying 1-ft square tiles on a square bathroom floor. If he needs 81 tiles to cover the floor, how many tiles run along each wall.

I’m stuck on this i don’t understand.

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane