Which of the following is used to represent complex numbers? A.
x2 + y
B
C.
bi + 2
D.
a + bi

 D) a+bi

Where both a and b are real numbers.

In your textbook, you might see to indicate that they are real numbers.

An example would be 7+13i, where a = 7 and b = 13.

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2

step-by-step explanation:

try remembering the steps