Suppose that a "code" consists of digits, none of which is repeated. (a digit is one of the numbers 0,1,2,3,4,5,6,7,8,9.) how many codes are possible?

Need on this geometry question. explain how you did it.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers