How many patients had allergies or ear infections, but not both? 24 27 36 40

The la dodgers hit the most homeruns in 2014. the number of homeruns accounted for 6% of the entire major leauge baseball homerun count. if 583 total homeruns were hit, approximately how many did the la dodgers hit

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

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