How to write -5/3x-6 in standard form

Iam so stuck. what is the worked out answer for this question?

Which statement best describes a square? a. a special rectangle that has four right angles b. a special trapezoid that has four sides of equal length c. a special rectangle that has four sides of equal length d. a special trapezoid that has four right angles

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg