Q3(13). Given two numerical row vectors v1, and numerical column vector v2. Both lengths are unknown, 

but more than 50 elements in each. 

1.(2) Code to remove the last 5 elements of v1. Require one line of code. 

2.(1) Code to find how many elements in the vector v2. Require one line of code. 

3.(3) Code to add the mean (the average of all elements) of v2 to the beginning of vector v2. 

4.(4) Code to update v1: minus 3 from all odd locations elements of vector v1. 

i.e. 1st, 3rd, 5th... elements. Require one line of code.

MATLAB

5.(3) Add the elements of v2 to the end of vector v1.