For the remaining questions write your answers in pen or pencil, scan and upload 4) What are the round and square brackets generally used for 5) Write the expression to assign to X variable a 3 x 3 matrix with the numbers 1 thru 9. 6) Write an expression to return the element in the 3 row and 2 column of matrix X above in question 6 7) What is the single command or function used to find the number of rows and columns in x. write it below as it operates on x: 8) What is the difference between 10e2, 10exp(2) and 10*exp(2) Explain each 9) Write the normal mathematical equations equivalent to the following MatLab expressions: 2/(1+n)+1 X=u*t-g/2*1*2 y- y^3/(3*2)+ x^5/(5*4*3*2*1) x=(-b+sqrt(b^2-4*a*c)) (2*a)