Question

qual e o numero que devemos adicionar a : -10 para obter +4 ?

Answer 1

Temos que adicionar +14, pois -10+14= +4 .

Answer 2

$x+(-10)=+4\to \\\\ x-10=4\to \\\\ x=4+10\to \\\\ x=14\\\\\\\\\\ Verificando:\\\\ 14+(-10)=4\to \\\\14-10=4\to \\\\ 4=4$