Tangible refers to things we can see and feel whereas intangible are things that cannot be seen or felt. Let us understand this by an example. Suppose the cost of doing an MBA course from a top business schools is $100000 while the cost of a low rung school is $50000.
Complex numbers have both a real number element and an imaginary number element, usually in the form a + bi. In this form, a and b are real numbers, while i is an imaginary number. An imaginary number is the designation given for the square root of negative one. Many careers that employ higher mathematics also use complex numbers, which can help simplify mathematical equations that would otherwise be much longer.
So we can make an imaginary number by taking a real number like 5 and multiplying it by i. That gives us 5i. Some other imaginary numbers are. Note that the square of any imaginary number (except 0) is a negative number. Complex numbers are numbers like 7 + .4i; they're a real number plus an imaginary number.