Keith is 4 years older than twice sheila's age. Sheila is y years old. What expression can be used to find keith's age?

Find the measures of the complement and the supplement of each angle, m

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

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