Problem $4.(5$ points$)$a$)$ Create a vector x that has nine equally spaced values between $3$ and $3.$b$)$ Write a command to extract $0\mathrm{.}75$ from the vector x and save it to a variable valuec$)$ Write a command to save the value at index $3$ in vector x to a variable called value$2$d$)$ Write a command to create a new vector newvec which has the values in index $2,4$ and $6$ of xe$)$ Write a command to replace the element in index $9$ in x with $99$