PLEASE HELP!!

Which of the following is a complex number?

Choose the more precise measurement. 26.4 cm or 8.39 cm

With finding limits of multi variable !

Choose the equation below that represents the line that passes through the point (2, 4) and has a slope of 3. a) y − 4 = 3(x − 2) b) y − 2 = 3(x − 4) c) y + 4 = 3(x + 2) d) y + 2 = 3(x + 4)