Which of the sequences is an arithmetic sequence? a. 154, 71, 8, 5, 2, b. 12, –24, 36, –48, 60, c. 1, 5, 10, 15, 20, d. –20, –27, –34, –41, –48, ..

D

Step-by-step explanation:

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.