How to do 264 in Expanded form

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 is he correct? explain why or why not?

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