Answer:
Step-by-step explanation:
Answer: 180
Step-by-step explanation:
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If you want to find kmph, you could make a ratio, 30:30, and multiply each to get 60km in 60 min.so the answer is 60km in 1hr
First you to eliminate i from denominator.
mult by (7+3i) above and below
=(49+42i-9)/(49-9)
which is (40+42i)/40 which can simplify