Question 154605

{{{h=18t+(1/2)at^2}}}
{{{2*h=2(18t+(1/2)at^2)}}}    (multiply both sides by 2 to clear the fraction)
{{{2h=36t+at^2}}}
{{{2h-36t=36t+at^2-36t}}}     (subtract 36t from both sides )
{{{2h-36t=at^2}}}
{{{(2h-36t)/t^2=at^2/t^2}}}    (divide both sides by {{{t^2}}})
{{{(2h-36t)/t^2=a}}}
So
{{{a=(2h-36t)/t^2}}}