−7−(−5)+8.5+(−13)=? -7-(-5)+8.5+(-13)=\text{?} −7−(−5)+8.5+(−13)=?
Let's begin by expanding the parentheses. Make sure to pay attention to the minus and plus signs, which change accordingly:
−(−5)=5 -(-5)=5 −(−5)=5
8.5+(−13)=8.5−13 8.5+(-13)=8.5-13 8.5+(−13)=8.5−13
We should obtain the following:
−7+5+8.5−13= -7+5+8.5-13= −7+5+8.5−13=
Now let's solve the exercise from left to right:
−2+8.5−13= -2+8.5-13= −2+8.5−13=
6.5−13=−6.5 6.5-13=-6.5 6.5−13=−6.5
−6.5 -6.5 −6.5