Question

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Answer 1

First multiply numerator and denominator by 10i to remove the imaginary number from the denominator. Can you do that?

Answer 2

nopes,
hint :
1/i = -i

Answer 3

i * i = -1
Also you can multiply numerator and denominator by i instead of 10i.

Answer 4

\(\huge i=\sqrt{-1} \\ \huge i^2=-1 \\ \huge 1/i=-i \\ \huge 7/(10i)= (7/10)(-i)=-7i/10\)

Answer 5

No. -(7i/10)

Answer 6

You're welcome :)

Answer 7

yup.