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In the figure above the circle has center O, and AB and AD are tangent to the circle. If the degree measures of angles ABC and ADC are 20 and 40, respectively, what is the value of x+y?
What is the range of the number of voters in favor of Republican Party on different issues?
List K consists of 100 numbers between 20 and 40, and list M consists of 200 numbers between 30 and 50.

Quantity A

The arithmetic mean of the numbers in list K

Quantity B

The arithmetic mean of the numbers in list M




The table above summarizes customer satisfaction ratings for two banks, where each rating is an integer from 1 to 10. Which of the following statements must be true?

Indicate all such statements.


According to the table, the percent of households in 1980 with neither a microwave oven nor a central air conditioner must be in which of the following inclusive intervals?
The letters in a certain name can be arranged in exactly 180 different orders. Which of the following could be that name?
Baron's book implores scientists to present their work in ways that are accessible to the general public in order to save the world at large from scientific illiteracy, ______________ that is echoed in other recent publications.
Materials expand and contract with temperature changes. This general concept has been exploited for thousands of years, for instance, to ensure tight rivets in blacksmithing by shrink-fitting. For precision instruments, however, (i) _____________ materials are truly (ii) _____________ : hence the importance of Invar, an alloy notable for its (iii) _____________ expansion and contraction over a range of temperatures.
The _____________ of criteria for determining what is meant by "balance" and whether it is beneficial makes it difficult to evaluate claims that probiotics promote a healthy balance of microorganisms in the body.
The tools of science are so specialized that we accept them as a kind of _____________ machinery for producing knowledge: we know that they work, but cannot explain why.
The enthusiasm for dancing in New Zealand during the 1920s and 1930s to some extent (i) _____________ in both the United States and Britain, where new dance halls (ii) ___________ in response to customer demand, although the rampant commercialization associated with larger populations in the United States was not so apparent in New Zealand.
She may have been (i) _____________ when she was finance minister, fighting deficits, but now as prime minister she is marked by her (ii) _____________.
Developments in neuroscience and animal behavior have led researchers to question the view that unmitigated competition is ______________ animal life: in primatology, the countermovement started with research into how friendships and conflict resolution favor survival.
The primary purpose of the passage is to
$$a_1, a_2, a_3,........a_n,.........$$

In the sequence shown, $$a_1$$=6

and for each integer n greater than 1, $$a_n$$ is defined by

If $$n$$ is even, then $$a_n=2+a_{n-1}$$ (n≥2)

If $$n$$ is odd, then $$a_n=-8+a_{n-1}$$ (n≥2)

What is the value of $$a_7$$?
In a game, the cards in a certain deck are distributed to players one at a time until each player has the same number of cards and there are not enough cards left in the deck to distribute one more card to each player. The number of cards in the deck is between 60 and 100. If the cards in the deck are distributed to 5 players, 2 cards will be left in the deck. If the cards in the deck are distributed to 6 players, 4 cards will be left. If the cards in the deck are distributed to 7 players, how many cards will be left in the deck?
An apple falls straight to the ground from a tree branch 8 meters above the ground. The apple's height above the ground, t seconds after it starts falling, is H meters, where H=8-4.9$$t^{2}$$ and t≥0. How many seconds after the apple starts falling does it hit the ground?

Give your answer to the nearest 0.1 second.
For two statistics classes, class A and class B, there are more students in class A than in class B. The heights of the students in both classes were measured.

Which of the following statements individually provide(s) sufficient additional information to conclude that the average(arithmetic mean)height of the students in class A is greater than the average height of the students in class B?

Indicate all such statements.

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