Goal:
To score lines on a piece of brass, you can
Answer:
Use a scalpel to score the lines

Goal:
Remove cracked light bulb from socket.
Answer:
Place half potato over bulb and unscrew both.

Goal:
How can I cut a cake that I made for my son's birthday?
Answer:
Take a knife and slice through the cake and serve it on plates.

Goal:
How spread butter on bread.
Answer:
Take a butter knife and cut a slice of butter and apply evenly.