Ten times the sum of half a number and 6 is 8

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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

What fraction is equivalent to 0.46464646··· a. 46⁄99 b. 46⁄999 c. 46⁄100 d. 23⁄50