Answer
$(-\infty, -1]\ or\ (25, \infty)$
Work Step by Step
$12h-3\geq15h\longrightarrow$ subtract 12h from each side
$12h-3-12h\geq15h-12h\longrightarrow$ subtract
$-3\geq3h\longrightarrow$ divide each side by 3
$-3\div3\geq3h\div3\longrightarrow$ divide
$-1\geq h$
OR
$5\gt-0.2h+10\longrightarrow$ subtract 10 from each side
$5-10\gt-0.2h+10-10\longrightarrow$ subtract
$-5\gt-0.2h\longrightarrow$ divide each side by -0.2; reverse the inequality sign
$-5\div-0.2\lt-0.2h\div-0.2\longrightarrow$ divide
$25\lt h$
