$1.$ Assign a variable $\text{'}$a$\text{'}$ with pi or the number $3\mathrm{.}14\mathrm{.}2.$ Round off $\text{'}$a$\text{'}$ to $2$ significant digits$\mathrm{.}3.$ Create a variable x$1$ with the following list of numbers: $5,2,4,4,1$; Create another variable x$2$ with the following list of numbers: $21,32,78,49,109$; What is X$1+$x$2?$