3. Define a function in Python language that takes two string parameters s1, s2 and print the value of s1s2 in the output. Also test the function for some test cases.

Write a function in Scala programming language that takes a string parameter and returns whether the string starts with "Sc" or not. Test the function for the sample strings "Scala", "Programming", "Science".

Write a C++ function to take a string s and index i as the parameters and remove the character at index i from the string s and return the modified string. The variable i will always be in the range 0 to s.length()-1.

PYTHON Code your own Python function to solve Ax=b. Add a documentation string section to be used with the Python function help() function. Demonstrate the function is correctly implemented, and explain your testing approach.