Expand -5/6 (9b-12).

To expand -5/6 (9b-12), we can distribute the fraction -5/6 to each term inside the parentheses.

First, let's distribute -5/6 to 9b:

-5/6 * 9b = (-5/6) * 9 * b = -45/6 * b = -45b/6

Next, let's distribute -5/6 to -12:

-5/6 * -12 = (-5/6) * (-12) = 60/6 = 10

So, -5/6 (9b-12) expands to -45b/6 + 10.