Write the following sentence using mathematical symbols:

$n$n is greater than $9$9.

$n$n is greater than or equal to $9$9.

$n$n is less than $10$10.

$n$n is less than or equal to $6$6.

Form and solve linear equations and inequations, quadratic and simple exponential equations, and simultaneous equations with two unknowns

Apply algebraic procedures in solving problems