Question

-1 - (-1.4) = 0.4
which addition equation matches the number line?
-1 + 1.4 = 0.4 -1.4 + 1 = 0.4
1 + (-1.4) = 0.4 -1 + (-1.4) = 0.4

Explanation:

Step1: Recall subtraction to addition rule

Subtracting a negative is adding its positive: \(a - (-b)=a + b\). Given \(-1-(-1.4) = 0.4\), rewrite it as addition: \(-1 + 1.4=0.4\).

Step2: Check other options

• For \(-1.4 + 1\): Calculate \( -1.4+1=-0.4

eq0.4\).

• For \(1+(-1.4)\): Calculate \(1 - 1.4=-0.4

eq0.4\).

• For \(-1+(-1.4)\): Calculate \(-1 - 1.4=-2.4

eq0.4\).

Answer:

\(-1 + 1.4 = 0.4\)