Answer: 10
Step-by-step explanation:
20 ÷ (4- (10-8))
First off, you work your way outward. You start the furthest in, then head your way out. (10 - 8) is the furthest in, and 10 - 8 = 2. So now your equation looks like this:
20 ÷ (4 - 2)
Next, you do the (4 - 2) which equals 2. So now, the equation is this:
20 ÷ 2
So you finish it up with 20 ÷ 2 which equals 10.
Hope I made sense! :D