Using the laws of indices, you can solve it.
Answer:
9.40
Step-by-step explanation:
the 5 makes the 9 go up and since it cant go up, then the 3 goes up and the 9 becomes a 0 so it is 9.40
Answer:

Step-by-step explanation:

Answer:
$0.07
Step-by-step explanation:
nails = 3.10/155 = 0.02/piece
screws = 7.65/85 = 0.09/piece
0.09 - 0.02 = 0.07