Q-18) Write the MATLAB code that finds how many letters the word entered by the user has on the keyboard and stops the program? (5 P1s.) Q-19) Suppose that the arrays A and B are generated using the MATLAB commands; A=1:10;B= linspace (1,10,10); are A and B equal and Why? (5 Pts.) Q-20) Create a function called "linsolution" which solve Ax=bx33=A1b(5Pts.)