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How can you use negative numbers to represent real-world problems?
An overdrawn balance on your bank account is a negative number !
What do negative numbers represent in real world situations?
Loss or negative growth, mostly in economic matters temperature
What do imaginary numbers represent?
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.
Are real numbers negative and positive numbers?
No.
What do he horizontal numbers represent?
In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
