The point P$(15,15)$ lies on the curve y$=3$x$.$ If Q is the point $($x$,3$x$),$ find the slope of the secant line PQ for the following values of x$.$

Round all answers to five decimal places. Note that the x$-$values are NOT in order!

If x$=0\mathrm{.}3,$ the slope of PQ is: $$

and if x$=0\mathrm{.}21,$ the slope of PQ is: $$

and if x$=0\mathrm{.}1,$ the slope of PQ is: $$