What does it mean for an event to have a probability of 1? a. there is a 100% chance that the event will not occur. b. there is a 100% chance that the event will occur. c. the event might occur. d. there is not enough information to determine.

When the probability of an event is 1, the event is definitely is happening. For example; the probability of getting either number 1, number 2, number 3, number 4, number 5, or number 6 when rolling a six-sided dice numbered 1 to 6. We definitely are going to get either number 1, 2, 3, 4, 5 or 6.

B

3x+9+4x+x=8x+9that's the answer for your question.