Line AB has endpoints A(-4, 1) and B(2, 4). Determine the distance.

1/2
-1/2
sqrt(21)
3sqrt(3)
3sqrt(5)
 

A PHP Error was encountered

Severity: Warning

Message: touch(): Unable to create file sessions/ci_sessiona7ff1005f06580ee0ad736c635df2777b4c1738f because No such file or directory

Filename: drivers/Session_files_driver.php

Line Number: 252

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: sessions)

Filename: Unknown

Line Number: 0

Backtrace: