Question 545264
Given:
a) {{{D = 1.2sqrt(h)}}} Solve for h. Divide both sides by 1.2
{{{D/1.2 = sqrt(h)}}} Now square both sides.
{{{(D/1.2)^2 = h}}} or 
{{{h = D^2/1.44}}}
b) {{{D = 1.2sqrt(h)}}} Substitute h = 14,255
{{{D = 1.2sqrt(14255)}}}
{{{D = 1.2(119.3943)}}}
{{{D = 143.273}}}miles Approx.
I'll leave the explanation toyou.