4. Fill in the blanks to make the following statements true. (a) (-9) + (-11) = (-11) +
(b) -17 +
= -17
(c) [(-15) + (-10)] + (
) = -15 + [(-10) + (-9)
(d) 10+
= 0
(e) 246 + (-132) =
+ 246
(f) 65 + {(-85 + 7)} = {
+(-85)) + 7
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4. Fill in the blanks to make the following statements true. (a) (-9) + (-11) = (-11) +
(b) -17 +
= -17
(c) [(-15) + (-10)] + (
) = -15 + [(-10) + (-9)
(d) 10+
= 0
(e) 246 + (-132) =
+ 246
(f) 65 + {(-85 + 7)} = {
+(-85)) + 7
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