Evauate 15 divide by r minus 1 when r = 5

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

Spencer has 1/3 pound of nuts he divides them equally into 4 bags what fraction of a pound of nuts is in each bag

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply