The function p$($x$)=-0\mathrm{.}2$x$^2+15$squaroot of x$+30$ gives the price of a stock, in dollars, over the first $25$ days of month.

a$.$ Find the five$-$day moving average value of the stock after the first $5$ days $($that is $,$ form x$=0$ to x$=5$ days$).($Round your answer to the nearest cent.$)$

b$.$ Find the five$-$day moving average value of the stock through the $8$th day $($that is $,$ form x$=3$ to x$=8$ days.$).($ Round your answer to the nearest cent.$)$