Use inductive thinking to guess the next number: 10, 9, 5, -4, -20, __?

The Moore family received 31 pieces of mail on April 27. The mail consisted of letters, bills, magazines, and ads. How many letters did they receive if they received three more bills than magazines, the same number of letters as magazines, and five more ads than bills? Keypad Answer Keyboard Shortcuts letters

How many 2-digit numbers of 2 different digits can be formed from the numbers 0,2,4,6,8? Select one: O 20 O 16 O 25 30 O None of the choices

Users of the online system for a Bank are required to set a password that is 10 character-long. Each character can be a letter, a 1-digit number, or a symbol from the list: !, @, #, &, % How many passwords are possible if there is no distinction between upper case and lower case letters? (Not Case-sensitive) How many passwords are possible if the first and last digits have to be numbers?