Answer:
Step-by-step explanation: The expression "i" represents the imaginary unit, which is defined as the square root of -1. When multiplied by a real number, it forms a complex number with a real part and an imaginary part.
To identify each expression equivalent to "i" when multiplied by different numbers, we can apply the properties of the imaginary unit:
1. i15:
Multiply the imaginary unit "i" by 15.
The result is 15i.
2. i21:
Multiply the imaginary unit "i" by 21.
The result is 21i.
3. i33:
Multiply the imaginary unit "i" by 33.
The result is 33i.
4. i47:
Multiply the imaginary unit "i" by 47.
The result is 47i.
5. i56:
Multiply the imaginary unit "i" by 56.
The result is 56i.
In each case, when "i" is multiplied by a real number, the result is a complex number with an imaginary part equal to the real number multiplied by "i".