<span>To reduce chances of system failure, engineers may use process control. This is a system which involves activities that ensures the whole process variables can be predicted and controlled to prevent failure. This involves the use of safety valves and sensors.</span>
        
                    
             
        
        
        
Answer:
// here is code in c++ to find the approx value of "e".
#include <bits/stdc++.h>
using namespace std;
// function to find factorial of a number
double fact(int n){
double f =1.0;
// if n=0 then return 1
if(n==0)
return 1;
for(int a=1;a<=n;++a)
        f = f *a;
// return the factorial of number
return f;
}
// driver function
int main()
{
// variable
int n;
double sum=0;
cout<<"enter n:";
// read the value of n
cin>>n;
// Calculate the sum of the series
   for (int x = 0; x <= n; x++)
   {
      sum += 1.0/fact(x);
   }
   // print the approx value of "e"
     cout<<"Approx Value of e is: "<<sum<<endl;
return 0;
}
Explanation:
Read the value of "n" from user. Declare and initialize variable "sum" to store the sum of series.Create a function to Calculate the factorial of a given number. Calculate the sum of all the term of the series 1+1/1!+1/2!.....+1/n!.This will be the approx value of "e".
Output:
enter n:12
Approx Value of e is: 2.71828
 
        
             
        
        
        
Answer:
In C++:
#include <iostream>
using namespace std;
int main(){
    string fname,lname; int num;
    cout<<"Firstname: "; cin>>fname;
    cout<<"Lastname: "; cin>>lname;
    cout<<"4 digits: "; cin>>num;
    string login = lname;
    if(lname.length()>=5){
        login = lname.substr(0, 5);    }
    login+=fname.substr(0,1)+to_string(num%100);
    cout<<login;
    return 0;
}
Explanation:
See attachment for explanation where I used comments to explain each line
 
        
             
        
        
        
The answer is B Okay good luck and dont...mess it up