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The author implies that red fire ants in the United States differ from red fire ants in South America in the extent to which ants in the two environments
Tao Zhu and Yaobin Lu found that personality traits can affect user adoption of mobile commerce, suggesting that a mobile service provider could benefit from ____________ the market, specifically targeting extroverts, for instance.
A certain company made neither a profit nor a loss on the first 1,000 widgets it sold and made a profit of $0.50 on each widget it sold after the first 1,000. If the company's total profit from the sale of widgets was $$p$$ dollars, what is the number of widgets it sold, in terms of $$p$$?
A circular region with positive diameter $$d$$ has the same area as a square region with sides of length $$s$$.

Quantity A

$$d$$

Quantity B

$$s$$


If $$15 \leq r \leq 18$$ and $$30 \leq s \leq 36$$, what is the greatest possible value of the average (arithmetic mean) of $$\frac{1}{r}$$ and $$\frac{1}{s}$$?
In the xy -plane, the points (2, 7) and (8, 3) are the endpoints of a line segment that is the hypotenuse of a right triangle.

Quantity A

The x -coordinate of the vertex at the right angle of the triangle

Quantity B

The y -coordinate of the vertex at the right angle of the triangle


If N is a positive integer, then the number of prime numbers between N+1 and N+6, inclusive, CANNOT be
Machines A and B each assembled 3,000 metal clips in 15 hours and 12 hours, respectively, working alone at their constant rates. On Monday, working simultaneously at their respective constant rates, the two machines assembled a total of n clips in x hours. The next day, machine A was modified so that its constant rate decreased by 25 percent. If the two machines worked simultaneously at their respective constant rates for x hours after the modification of machine A, then the total number of clips that they assembled in x hours was approximately what percent less than it was the day before?
The average (arithmetic mean) and the median of a set of 5 numbers is 0, and the set contains at least one number that is not equal to 0. Which of the following statements must be true?
The median value for a sample of 7 numbers is 50.

The median value for a sample of 9 numbers is 52.

Quantity A

The median value for the combined sample of the 16 numbers

Quantity B

51




Some renewable energy technologies are quite ____________: for example, hydro power from dams and rivers has been a source of power generation since the early 1900s, and today it supplies sixteen percent of electricity worldwide.
According to a survey of 300 college students, 40 percent had students loans and 25 percent had scholarships. If 55 percent of the students surveyed had neither student loans nor scholarships, how many of the students had both student loans and scholarships?
In a barrel, there are in ping-pong balls labeled with consecutive integers from $$1$$ to $$n$$, where $$n$$ is an odd integer greater than $$50$$. If a ball is to be randomly selected from the barrel, what is the probability that the ball selected will be a ball that is labeled with an odd integer?
In an appliance store, the ratio of the number of radios in stock to the number of television sets in stock is 0.4. Exactly 10 radios and $$x$$ television sets are added to the appliances in stock, and the ratio of radios to television sets in stock remains at 0.4.

Quantity A

$$x$$

Quantity B

30


A bag contains 32 identically wrapped pieces of candy, of which 7 are mints, 11 are caramels, and the rest are chocolates. If Jill selects pieces of candy at random, what is the least number she must remove from the bag to be sure that she gets a caramel?
If dark energy is an energy field, it would not be ____________: it might once have been stronger or weaker than it is now and could have affected the universe differently at different times.
One of the incongruities of modern industry, according to Reck and Graedel, is that we manufacture modern products with the most sophisticated technologies available yet generally adopt relatively ____________ approaches to recycling them.
In the xy-plane, the point $$(t, t-1)$$ lies on the line with equation $$y=-\frac{1}{2} x +\frac{1}{3}$$. What is the value of $$t$$?

Give your answer as a fraction.
In a study of the size of frogs, group I consists of five frogs whose average (arithmetic mean) length is 4.7 centimeters. Group II consists of five frogs whose lengths are 4.3, 4.6, 4.7, 4.8, and 5.1 centimeters.

Quantity A

The standard deviation of the lengths of the five frogs in group I

Quantity B

The standard deviation of the lengths of the five frogs in group II


The number of different subsets of 4 elements that can be selected from a set of 6 elements is 15. How many different subsets of 3 elements can be selected from a set of 7 elements?

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