Write the following MATLAB functions: •B = swap(A, i, j). Here A is an (n × n) matrix and, i and j are indices. The
function should take the matrix A and swap the rows i and j. Output the resulting
matrix as B.
• index = max entry(A, i). Here A is an (n × n) matrix and i is an index. The
function should extract the column i of A, and find the maximum (in modulus!)
entry of that column below the diagonal entry A(i, i) (including the diagonal
entry). Output the row index of the maximum entry in index.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)