So that its well secured and not misused by unauthorized persons
The expert system are given inputs such as questions, locations and information. The expert system processes and advice the user on what to do. If the user inputs the location of an oil site and ask a question if they are able to drill an oil out of the site, then the expert system calculates and gives you the answer you need. Though the expert system makes errors just like humans.
Answer:
The proof is in the explanation
Explanation:
is 
if 
for 
.
So, basically, we have to solve the following inequality
Dividing everything by 
to simplify, we have
I am going to use 
. So
There is a solution for the inequality, which proves that 
is
Answer:
b. myString[:-5]
d. myString[-15:-5]
Explanation:
I believe you have a typo in d. It must be d. myString[-15:-5]
Slicing can be done:
myString[starting_index, stopping_index, step] (step is optional). If you do not specify the starting index, it will start from the 0 as in b. If you write a range that is not in the range, as in d, Python will replace it with either 0 or length of the string (In this case, it is replaced with 0 because the starting index must be smaller than stopping index)
a. myString[5] → This will give you the sixth character
b. myString[:-5] → This will give you the first five characters
c. myString[0:6] → This will give you the first six characters
d. myString-15:-5] → This will give you the first five characters
e. myString[0:10:2] → This will give you the first, third, fifth, seventh, and ninth characters
