HELP WITH #21 PLEASE! ORDER THE SIDES OF EACH TRIANGLE FROM SHORTEST TO LONGEST

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"