Use MATHLAB and answer them all please

Summer 2016 5. What would happen if you use the name of a built-in function, for example, cos, as a variable name? 14] vaable tis caued 6. Use your own words to describe the local variable and global variable, what are the scope of these two types of variables? [6] 7. If you are given a vector vec (33 7 -9 21 -5 32 72 65 -39) that erroneously stores nega- tive values, how can you eliminate those negative values? Use two methods. [6]