1. Please create three normally distributed random number matrices a, b and c with dimension 3X3, 3X1 and 1X4 respectively. Please perform the following operation: 1). Create a matrix d from the third column of matrix a. 2). Combine matrix b and matrix d to create matrix e, a two-dimensional matrix with three rows and two columns. 3). Combine matrix b and matrix d to create matrix f, a one-dimensional matrix with six rows and one column. 4). Create a matrix g from matrix a and the first three elements of matrix c, with four rows and three columns. 5). Create a matrix h with the first element equal to a22, the second element equal to c12, and the third element equal to b21.

2. Please output the fifth largest number from a two-dimensional matrix with more than 5 elements and no repeated values.

3. Chemical reaction rates are proportional to a rate constant k that changes with temperature according to the Arrhenius equation For a certain reaction, Q=5000 cal/mol; R=1.987 cal/mol K; k0=1000 min-1. Find the values of k for temperatures from 50 K to 470 K, in 20 degree increments. Create a table of your results.

MATLAB**