Finall Answer:
The equivalent expression is a) 3x+3.
Step-by-step explanation:
This answer represents the correct equivalent expression for the given algebraic model.
The expression 3(x+1) means that you have three groups of (x+1). So, if you distribute the 3 to both terms inside the parentheses, you get 3x + 3, which accurately represents the model using algebraic tiles. Each group of (x+1) comprises an 'x' tile and a '1' tile, totaling '3x' tiles and '3' unit tiles. This corresponds to option a) 3x+3.
Therefore, the correct answer is a. probability.