#### Answer

(a) The answers are similar because their absolute values are the same. The answers only differ in their signs.
(b) When you switch the order of the numbers in a subtraction problem, the answer becomes the opposite (additive inverse) of the original answer.
In symbols, for any real numbers $a$ and $b$, $a-b = -(b-a)$

#### Work Step by Step

From Exercise 98, we have the following answers:
\begin{array}{cc}&\space-3-5=-8; &5-(-3)=8
\\& \space -4-(-6)=2; &-6-(-4)=-2
\\& \space 3-10=-7; &10-3=7
\end{array}
(a) The answers are similar because their absolute values are the same. The answers only differ in their signs.
(b) When you switch the order of the numbers in a subtraction problem, the answer becomes the opposite (additive inverse) of the original answer.
In symbols, for any real numbers $a$ and $b$, $a-b = -(b-a)$