Which of the following numbers belong to the set of complex numbers and the set of imaginary numbers? select all that apply. (3 total)

a. 3i
b. -5i
c. 6-i
d. √21
e. -√16
f. √-14

i believe it's a, b, and c.

Find the value of the variable and the length of each secant segment.

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Solve the equation by completing the square. x^2+2x=17