Lt takes 12 hoursto clean the windows of a certain office building. During the first day of cleaning, the workers were able to clean for 9 hours. f the variable tstands for the amount of time the workers have left to clean the windows, which of the following choices is the most reasonable value for t? A 20 hours
B. 3 hours
C. 30 hours
d. 1 hour

Which of the following properties can be used to show

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

Need on this geometry question. explain how you did it.