Why should you be careful about opening a file for write operations? if the file already exists, you will generate a syntax error. if the file already exists, the existing file will be replaced by the new file. if the file already exists, your data will be added to the existing file. if the file already exists, you will have two files with the same name!

How can you know if the person or organization providing the information has the credentials and knowledge to speak on this topic? one clue is the type of web site it is--the domain name ".org" tells you that this site is run by a nonprofit organization.

Alook-up table used to convert pixel values to output values on a monitor. essentially, all pixels with a value of 190 or above are shown as white (i. e. 255), and all values with a value of 63 or less are shown as black (i. e. 0). in between the pixels are scaled so that a pixel with a value p is converted to a pixel of value 2/127 −+3969). if a pixel has a value of 170 originally, what value will be used to display the pixel on the monitor? if a value of 110 is used to display the pixel on the monitor, what was the original value of the pixel?

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false