If the age of person A is 7 years more than that of person B and the sum of there ages is 25 years old how old is person A ? (Brainlest)

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

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