Final answer:
None of the provided options (a. -4.5, b. 0 - 4i, c. 4 + 5i, d. 4 - 5) are equivalent to -80; each is either a real number far less in magnitude or a complex number which cannot be compared directly with a real number.
Step-by-step explanation:
To determine which expression is equivalent to -80, we need to evaluate each option:
a. -4.5 is not equivalent to -80 because it is a real number that is far less in magnitude than -80.
b. 0 - 4i is a complex number where the real part is 0 and the imaginary part is -4i, which is not equivalent to -80.
c. 4 + 5i is another complex number that is not equivalent to -80 since its real part, 4, and imaginary part, 5i, do not combine to -80.
d. 4 - 5 is a simple arithmetic expression which equals -1, again not equivalent to -80.
Therefore, none of the provided options are equivalent to -80.