#### Answer

LCD is 72.

#### Work Step by Step

To find the least common denominator factor each denominator then multiply each factor the greatest number of times it occurs in either number.
$36=2\times2\times\underline3\times\underline3$
$24=\underline2\times\underline2\times\underline2\times3$
$LCD=2\times2\times2\times3\times3=4\times6\times3=24\times3=72$