matlab codes for a simple matrix

A =

1 2 5 7

-1 2 1 -2

4 6 8 0

how can i get these

a)a13+a12.

(b) Three times the 3rdcolumn ofA.

(c) Twice the second row ofAminus the 3rdrow.

(d) The sum of all of the columns of ofA

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the free MATLAB Onramp tutorial ( https://www.mathworks.com/support/learn-with-matlab-tutorials.html ) to quickly learn the essentials of MATLAB.

[bassam saif]

@Steven Lord I’m asking how can I do these application like multiple or adding or sum

[bassam saif]

like how can i add the a12 to a34

[Steven Lord]

This type of basic arithmetic and indexing is covered in the MATLAB Onramp tutorial. But if you don't have the time to go through the MATLAB Onramp I recommend reading the Getting Started section of the documentation.