11 . A
Plug both x and x + 2 into the definition:
Then set the sum equal to x and solve:
12 . C
Probability is favorable outcomes over total outcomes. Here the total number of possible
outcomes is the number of points with both coordinates of integer absolute values less than
- That’s all the points with x-coordinates of −3, −2, −1, 0, 1, 2, or 3 and y-coordinates of −3,
−2, −1, 0, 1, 2, or 3. Seven possibilities for x and seven possibilities for y makes 7 × 7 = 49
possibilities for (x,y):
Total outcomes = 49
