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Find the Sum or Difference $9 \mathrm { i } + ( - 9 - \mathrm { i } )$

Question 129

Multiple Choice

Find the sum or difference. Write the answer in standard form.
- $9 \mathrm { i } + ( - 9 - \mathrm { i } )$

A) $- 9 + 8 \mathrm { i }$
B) $9 - 10 \mathrm { i }$
C) $9 - 8 \mathrm { i }$
D) $- 9 + 10 \mathrm { i }$

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