3 years ago

Simplify the expression to a +bi form: (-12+4i)+(2-2i)

Mathematics

2 answers:

ololo11 [35]3 years ago

8 0

Answer:

Step-by-step explanation:

-12 + 2 + 4i - 2i

-10 + 2i

AfilCa [17]3 years ago

7 0

Answer:

-10+2i

Step-by-step explanation:

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If John can mow the lawn in 2/3 of an hour and George can mow the lawn in 1 hour, how long will they take to mow the lawn togeth

snow_tiger [21]

This is esay to do when you realize the the speed of mowing is addtive. This is if John mows at 1 lawn / (2/3) hour and Gerge mows at 1 lawn / 1hour, the total speed of mowing is:

1 / (2/3) + 1 = 3/2 + 1 = 5/2

=> 5/2 of lawn per hour

Now, the time is calcualted as the amount of lawn divided by the speed:

1 lawn / (5/2 lawn/hour) = 2/5 hour.

Answer: 2/5 of an hour.

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3 years ago

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3 years ago

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