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In which year did Leonhard Euler introduced the symbol "i" to represent the square root of -1 ?

in 1555
in 1666
in 1777
in 1888
The letter "i" as a designation of the element from -1 was proposed by Leonhard Euler in 1777. Later, from 1801, this designation was popularized by Carl Friedrich Gauss. Currently, it is the most commonly used symbol of the imaginary unit.
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14

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east
west
north
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What is the maximum distance a plane can fly travelling constantly North?

10,002 km
20,004 km
40,007 km
It can fly endlessly (as long it can)

How many edges does a Möbius strip have?

one
two
three
four

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9
3
7
5