How many different sets of two-letter initials can you make using the letters D, G, M, S, and T if you can use each letter only once in a set?

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

If the value of cos330°is√3/2 then find cos 165°.