Determine whether x + 4 is positive or negative when(a) x > −4;(b) x < −4.(c) If you...

Determine whether x + 4 is positive or negative when

(a) x > −4;

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(b) x < −4.

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(c) If you multiply both sides of the inequality by x + 4, should you change the direction of the inequality sign? If so, when?

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(d) Explain how you can use parts (a)–(c) to solve correctly.