PLS I NEED TO FINISH THIS PLS HELP

What is the value of x when x + 7 = 21?

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

Of to(3, 4) (2,1) (3,7) (5,2) (5,-2) (3, 3) (-2, 3) (1,2) (-4,-2) (-3, 1) (4, -1) (-1, 1) 10 v 29