2.4 12. Use tiles or a number line to subtract. Write the subtraction equations. a) $(+4)-(+1)$ b) $(+5)-(-1)$ c) $(+2)-(-2)$ d) $(-4)-(+1)$ e) $(-6)-(-2)$ f) $(-10)-(-5)$ g) $(-4)-(-2)$ h) $(-5)-(-10)$ 13. Subtract. a) $(+7)-(+2)$ b) $(-7)-(+3)$ c) $(-4)-(-5)$ d) $(+3)-(+3)$

Step 1 ：\( (+4)-(+1) = \boxed{3} \)

Step 2 ：\( (+5)-(-1) = \boxed{6} \)

Step 3 ：\( (+2)-(-2) = \boxed{4} \)

Step 4 ：\( (-4)-(+1) = \boxed{-5} \)

Step 5 ：\( (-6)-(-2) = \boxed{-4} \)

Step 6 ：\( (-10)-(-5) = \boxed{-5} \)

Step 7 ：\( (-4)-(-2) = \boxed{-2} \)

Step 8 ：\( (-5)-(-10) = \boxed{5} \)

Step 9 ：\( (+7)-(+2) = \boxed{5} \)

Step 10 ：\( (-7)-(+3) = \boxed{-10} \)

Step 11 ：\( (-4)-(-5) = \boxed{1} \)

Step 12 ：\( (+3)-(+3) = \boxed{0} \)