1. Which command will return the corner elements of a 10-by-10 matrix A? A.  A([1,end], [1,end]) B.  A([1,1], [end,end]) C.  A({[1,1], [1,end], [end,1], [end,end]}) D.  A(1:end, 1:end) 2. Which command will return the fraction of positive numbers in a 10-by-10 matrix A? A.  A(A > 0)/A B.  numel(A > 0)/numel(A) C.  sum(A > 0)/prod(size(A)) D.  nnz(A > 0)/numel(A) 3. Which command will delete (completely remove) the last cell of a cell-array C? A.  C{end} = []; B.  C[end] = []; C.  C(end) = []; D.  C{end} = {[]}; 4. Which command will create a plot of acceleration vs. time (i.e., a vector time on the x-axis and a vector acceleration on the y-axis)? A.  plot(time, acceleration) B.  plot(acceleration, time) C.  plot([time, acceleration]) D.  plot([acceleration, time]) 5. Which command will give the standard deviation for each column in a 10-by-5 matrix Z? A.  std(Z(:)) B.  std(std(Z)) C.  std(Z(1:5, :)) D.  std(Z)   How to answer above questions based on Matlab!