Which expression can be used to find the value of x in the triangle shown?

On a trip, you had to change your money from dollars to british pounds.  you got  560  pounds for  800  dollars.  which is a unit rate that describes the exchange

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

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