$1.$ Empirical running time. $(6$ points$)$

Suppose that you observe the following running times $($in seconds$)$ for a program on graphs with $\backslash ($ V $\backslash )$ vertices and $\backslash ($ E $\backslash )$ edges.

running time of the program $($in seconds$)$

$($a$)$ Estimate the running time of the program $($in seconds$)$ for a graph with $\backslash ($ V$=640,000\backslash )$ vertices and $\backslash ($ E$=640,000\backslash )$ edges.