1/2[7-(-6)]-11

Question

just need help figure that out

Answer 1

Work out what's inside the square brackets first: it's 7 + 6, or 13, because of the two consecutive - signs being interpreted as +.

 

So now you have ½[13] - 11; that becomes 6½ - 11 = -4½ or negative 4.5, in decimal.