Respuesta :
9n+15≤10n+24 subtract 15 from both sides
9n≤10n+9 subtract 10n from both sides
-n≤9 divide both sides by -1 and reverse inequality sign because of division by a negative value...
n≥-9
9n≤10n+9 subtract 10n from both sides
-n≤9 divide both sides by -1 and reverse inequality sign because of division by a negative value...
n≥-9