Look at this set of 7 numbers:

5 2 6 4 3 6 6

By how much would the median increase if the number 7 replaced one of the 6's in the set?

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.