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12. Using the linspace command, create a row vector (assign it to a variable named Nines) with nine elements that are all 9 13. Use a single command to create a row vector (assign it to a variable named a) with 6 elements such that the last element is 4.7 and the rest of the elements are 0s. Do not type the vector elements explicitly. 14. Use a single command to create a row vector (assign it to a variable-named b) with 8 elements such that the last three element are 3.8 and the rest of the ele- ments are Os. Do not type the vector elements explicitly 15. Use a single command to create a row vector (assign it to a variable named b) with 11 elements such that 0 2 4 6 8 10 12 9 6 3 0 Do not type the vector explicitly. 16. Create two row vectors: a-2:3:17 and b-3:4:15. Then, by only using the name of the vectors (a and b), create a row vector c that is made from the ele- ments of a followed by the elements of b. 17. Create two column vectors: a- [2:3:17]' and b- [3:4:15] '. Then, by only using the name of the vectors (a and b), create a column vector c that is