Question: a. Evaluate -a for a = -3. b. Evaluate -a for a = -4. c. Evaluate -a for a = -6. d. A student says

a. Evaluate -a for a = -3.
b. Evaluate -a for a = -4.
c. Evaluate -a for a = -6.
d. A student says that -a represents only negative numbers because -a has a negative sign. Is the student correct? Explain.

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