Answer:
is there anymore to this problem because I would like to help you out more mate.
It stands for arithmetic logic unit
They are called functions on a spreadsheet.
Answer:
Four types of errors program should test for user input are given in explanation
Explanation:
1. Program should test that extension contains exactly three letters
2. Program should test that extension doesn't contain any number or special character
3. Program should test that extension doesn't contain any white space
4. Program should test that extension doesn't contain any punctuation mark
