(a) substitute $24^\circ$ for $\theta$ and calculate the current $i$ with your calculator in degree mode.
(b) use a graphing utility to plot $y = 0.735 \sqrt{\dfrac{x}{\sin(x+30^\circ)}}$ and $y = 3$. determine the intersection of the two graphs.
There is a free graphing utility called "Desmos" at https://www.desmos.com/calculator