Write a program that accepts an ISBN number and displays whether it is valid or not. An ISBN (International Standard Book Number) is a ten digit code which uniquely identifies a book. The first nine digits represent Group, Publisher and Title of the book and the last digit is used as a checksum (to check whether the given ISBN is valid). Each of the digits can take any value between 0 and 9. In addition, the last digit may also take a value X (stands for 10). To verify an ISBN, calculate 10 times the first digit, plus 9 times the second digit, plus 8 times the third and so on until we add 1 time the last digit. If the number 11 can divide the sum (no remainder), the code is a valid ISBN.

Need five questions ! take your time~question 1 excel is a tool used to a create a spreadsheet b design a brochure c make a presentation d write a letter question 2 a cell on an excel spreadsheet refers to a a type of document view b a page of the workbook c the rectangular box where a column and row intersect d the data in a worksheet question 3 tanya is entering the amount of money she has earned from babysitting onto an excel spreadsheet, but the autocomplete feature is not working. why? a autocomplete must be turned on before every entry. b autocomplete only works with professional spreadsheets. c autocomplete does not recognize types of currency. d autocomplete only works when the first character is text. question 4 which tab has formatting features to change the font style, color, size, and alignment? a file b home c insert d view question 5 brad uses excel to create a weekly schedule. he wants to keep using the same spreadsheet every year. one of his rows is titled "baseball," but the season has ended until next year. what is the most efficient way to modify the spreadsheet, so brad does not see baseball on his schedule but can easily get it back when the season starts again? a add a new comment with the start date of the next season b hide the row and unhide it when the new season begins c highlight the row in a different color to show the season has ended d start a new spreadsheet