Final answer:
Joey consumed 142 calories by eating half of a cinnamon roll, which was calculated by dividing the total calorie count of a whole cinnamon roll (284 calories) by two.
Step-by-step explanation:
To find out how many calories are in half a cinnamon roll, we need to calculate half of the total calories of the whole cinnamon roll. Given that one cinnamon roll has 284 calories, we can find half of this amount by dividing the total calories by 2.
½ of a cinnamon roll = 284 calories ÷ 2 = 142 calories
Therefore, Joey consumed 142 calories by eating half of his cinnamon roll. The correct answer is B. 142 calories.