单选题 The operationis defined as: nm = 2n/m If n and m do not equal zero, then for all of the following values nm=mn EXCEPT ______.
n=1 and m=1
n=2 and m=1/2
单选题 The first term in a geometric sequence is 3 and the 4th term is 81. What is the 10th term of the sequence?
单选题 The ratio of a person's weight on the moon to his or her weight on Earth is.If a person weighs 180 pounds on Earth, how much does he or she weigh on the moon?
1, 080 pounds
1, 800 pounds
单选题 At a college basketball game, the ratio of the number of freshmen who attended to the number of juniors who attended is 3：4. The ratio of the number of juniors who attended to the number of seniors who attended is 5：6. What is the ratio of the number of freshmen to the number of seniors who attended the basketball game?
单选题 Bill can inspect a case of cell phones in 6 hours. Jack can inspect the same case of cell Phones in 4 hours. After working alone for l hour, Bill stops for lunch. After taking a 30-minute lunch break. Bill and Jack work together to inspect the remaining cell phones. How long do Bill and Jack work together to complete the job?
1 hr. and l2 min
1 hr. and 24 min
2 hrs and lo min
2 hrs and 20 min
单选题 Which of the following describes one possible relationship between the values of x and y shown in the following table?
y varies directly as x
y varies inversely as x
y varies directly as the square of x
y varies inversely as the square of x
y varies directly as the square root of x
单选题 If I cup of milk is added to a 3-cup mixture that is 2/5 flour and 3/5 milk, what percent of the 4-cup mixture is milk?