Step-by-step explanation:

Answer:
2
Step-by-step explanation:
Bill paints 1/2 per hour. Bob paints 1/3 per hour. 1/2x+1/3x=1
I would pick the “D” the same line
For this case we must indicate an expression equivalent to:

For properties of powers we have to:

So, the above expression can be rewritten as:

Thus, the resulting expression is: 
Answer:

Option D