Write the following sentence using mathematical symbols:
$n$n is greater than $9$9.
Write the following sentence using mathematical symbols:
$n$n is greater than or equal to $9$9.
Write the following sentence using mathematical symbols:
$n$n is less than $10$10.
Write the following sentence using mathematical symbols:
$n$n is less than or equal to $6$6.
Write an inequality of the form x > c, x < c, x ≥ c, or x ≤ c to represent a constraint or condition to solve mathematical problems and problems in real-world context. Recognize that inequalities have infinitely many solutions; represent solutions of such inequalities on number lines.