Subtract: 2(10b + 4) - (b - 2)

To solve this problem, we will distribute the 2 to the terms inside the parentheses:

2(10b + 4) - (b - 2)
= 2 * 10b + 2 * 4 - (b - 2)
= 20b + 8 - (b - 2)

Next, we will remove the parentheses by distributing the negative sign inside the second set of parentheses:
= 20b + 8 - b + 2

Now, we can combine like terms:
= 19b + 10

Therefore, the simplified expression is 19b + 10.