How do you set up the combined probability of selecting a yellow hair clip, putting it back and then selecting a blue hair clip

Passengers usually start to board their flights 1 hour before the scheduled take off time. the gate will be closed 15 minutes before the takeoff time. jack’s plane is scheduled to take off at 12: 05 a. m. if he arrives at the gate at 11: 45 p. m., can he board the flight?

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What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.