Respuesta :
12.4 - b = 8.5
Add b to both sides:
12.4 = 8.5 + b
Minus 8.5 on both sides:
b = 3.9
Hope my answer helps :)
Add b to both sides:
12.4 = 8.5 + b
Minus 8.5 on both sides:
b = 3.9
Hope my answer helps :)