Explain how scientific methods are used to answer ...

If the 4 steps of the scientific method are followed, usually one can figure out whether a certain solution to a problem works or not.  This can take a while to actually lead to significant results, because you can only test one hypothesis at a time, but it does work.  Here is some comprehensive

In a nutshell, the scientific method works as follows:

1. Start by observing something, collecting evidence or facts.

2. Think of a way to explain what you've observed. Use your explanation to try to predict something you haven't observed yet. 

3. Test your explanation by trying to see if the prediction is correct or not.

4. Revise your explanation based on the test results.

This works because:

a. It's based  on repeatable observable facts, not wistful thinking.

b. It's fully transparent: anyone can repeat the process to confirm or deny another person's claims.

c. It's self-correcting. If mistakes are made, deliberate or otherwise, they will eventually be found and fixed.

d. It's an accumalitive process. Knowledge gained by older explanations is used to make new observations and test our understanding of them.

For a more technical explanation, you might want to read this:

http://en.wikipedia.org/wiki/Portal:Scientific_method 

a method that can be use is a telescope scientist can use it to look at a small object very well with it example cells.i think that scientist methods helps to discover \solve a problem easy but not at all times it helps them in a way that without their tool they can't get their job don