On this problem we use substitution to solve each system of equations

In which of the situations can information about tyler be represented by the expression r+3 when r represents information about ray? check all that apply.

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false