Are the following equations perpendicular y=-1/3x+4 and y=1/3x+12?

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

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Find the commission on a $590.00 sale if the commission is 15%.