40 is 60% of what number?
2 answers:
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Answer:
D
Step-by-step explanation:
So, recall the four basic i exponents:
The strategy here is to write the expression in terms of i to the fourth times another i.
For instance, 39 is the same as 36 plus 3. In other words:
Now, i^36 is the same as (i^4)^9. So:
And as we already know, i to the fourth is 1. So:
Simplify:
Again, i to the third is -i. So:
Our answer is D.
And we're done!