Which best values x satisfies the equation

Three coins are flipped. what is the probability that there will be at least two tails?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?