Lenny is playing a game where he flips a coin and rolls a number cube labeled 1 through 6. he listed the possible outcomes in the sample space shown below:
{(h, 1), (h, 2), (h, 3), (h, 4), (h, 5), (t, 1), (t, 2), (t, 3), (t, 4), (t, 5)}
which two elements did he leave out?

a: (h, 1) and (h, 6)
b: (h, 6) and (t, 6)
c: (h, 6) and (t, 1)
d: (t, 4) and (t, 6)

Last saturday, the museum box office sold 281 tickets for a total of $3,954. adults ticket cost $15, and students ticket cost $12. how many of each kind of tickets were sold?

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

Jennifer taking a quiz and has answered 13 questions so far. if there are 25 questions on jennifer test, how many questions does she have left to answer