An overdrawn balance on your bank account is a negative number !
Loss or negative growth, mostly in economic matters temperature
The real numbers together with the imaginary numbers form a sort of vector. What these complex numbers (complex means the combination of real and imaginary numbers) represent depends on the specific situation. Just as there are situations where it doesn't make sense to use negative numbers, or fractional numbers, in many common situations it doesn't make sense to use complex numbers. In an electrical circuit (specifically, AC), the real numbers might represent resistance, while the imaginary number represent reactance - and voltages and currents are also represented by complex numbers, with the angle of the complex number representing how much one quantity is ahead or behind another quantity (the "phase angle"). In quantum mechanics, the complex numbers might not represent anything (perhaps they don't, I am not sure...), but they are useful for calculations.
No.
In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
An overdrawn balance on your bank account is a negative number !
Loss or negative growth, mostly in economic matters temperature
It belongs to the set of negative rational numbers, negative real numbers, fractionall numbers, rational numbers, real numbers.
The real numbers together with the imaginary numbers form a sort of vector. What these complex numbers (complex means the combination of real and imaginary numbers) represent depends on the specific situation. Just as there are situations where it doesn't make sense to use negative numbers, or fractional numbers, in many common situations it doesn't make sense to use complex numbers. In an electrical circuit (specifically, AC), the real numbers might represent resistance, while the imaginary number represent reactance - and voltages and currents are also represented by complex numbers, with the angle of the complex number representing how much one quantity is ahead or behind another quantity (the "phase angle"). In quantum mechanics, the complex numbers might not represent anything (perhaps they don't, I am not sure...), but they are useful for calculations.
use a absolute value to represent a negative number in the real world
The product of nine negative real numbers is a negative real number.
use a absolute value to represent a negative number in the real world
No.
Yes. In general, real numbers include negative numbers; they also include numbers that have decimals.
In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
Yes. Real numbers include positive and negative numbers, integers and fractions, rational and irrational numbers.