Which statement is correct
a . a horizontal line had no slope
b. a vertical line has a slope of 0
c. a line that raises from left to right has a positive slope
d. a line that falls from right to left has negative slope

C) A line that raises from left to right has a positive slope

Step-by-step explanation:

for A, a horizontal line DOES have a slope, but it's 0

for B, a vertical line DOES NOT have a slop, since if it's a vertical line then it isn't a function

for D, a line the falls from right to left, aka rises from left to right, has a POSITIVE slope, since it is increasing from left to right

Therefore, the answer is C

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.