Respuesta :

24/8 = 3

so we know that what's in the "()" has to equal 3

-1 + 4 = 3

there for A equals -1
spoiledmilk
8(a+4)=24
÷8        ÷8 {divide each side by 8
a+4=3
  -4  -4 {subtract 4 from both sides to isolate the variable
a=-1