Code:
#include <iostream.h> 
int main() 
{ 
     cout << "Hello there.\n"; 
     cout << "Here is 5: " << 5 << "\n"; 
     cout << "A manipulator endl writes a new line to your screen." << endl; 
     cout << "here is a very big number:\t" << 70000 << endl; 

     cout << "here is the sum of 8 and 5:\t" << 8+5 << endl; 
     cout << "here is a fraction:\t\t" (float) 5/8 << endl; 
     cout << "and a very big number:\t" << (double) 7000 * 7000 << endl; 
     cout << "don't forget to add your name Jewa:\n"; 
     cout << "Jewa is now a programmer:\n"; 
     return 0; 
}

Most of the problems seem to be with the confusion with endl, abbreviation of endline. Try the code above.

ps dont forget to use code tags next time