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$$a_1, a_2, a_3, ......, a_n, ......$$
In the sequence of numbers shown, $$a_1=13^3$$, and $$a_n=a_{n-1}+13^3$$ for each integer $$n$$ greater than 1. If $$a_k=13^4$$ , what is the value of $$k$$?
In a group of 250 people who take classes at a community center, 75 people take drawing classes and 65 people take music classes. Which of the following could be the number of people in the group who take neither drawing classes nor music classes?
Indicate all such numbers.
Set $$A$$ and set $$B$$ each have 20 elements.
Which of the following statements individually provide(s) sufficient additional information to determine the number of elements in the intersection of $$A$$ and $$B$$?
Indicate all such statements.
The values of $$X$$ are normally distributed with a mean of 9 and a standard deviation of 2. The values of $$Y$$ are normally distributed with a mean of 3 and a standard deviation of 1.

Quantity A

The fraction of values of $$X$$ between 5 and 11

Quantity B

The fraction of values of $$X$$ between 1 and 4


Scientists sometimes want us to believe that the evidence speaks for itself, but evidence is rarely _______; people often disagree both about which facts count as evidence and what those facts prove.
Svitlana Mayboroda's recent work, though (i)_______ pure mathematics, is already being (ii)_______ by physicists, distinguishing it from most mathematical advances, for which the development of any practical use is long delayed.
Extant manuscripts of sixteenth- and seventeenth-century plays were produced through the combined efforts of an author, one or more scribes, and various compositors. The blending of labors is so complete that some scholars (i)_______ that the author' s contribution (ii)_______, a position that (iii)_______ the consideration of questions about authorial intention.
Shark teeth are among the most (i)_______ of all vertebrate fossils. While such (ii)_______ may befit creatures renowned for their appetites, it contrasts with the rarity of shark skeletons.
At their most ________, memoirs are about more than the story of someone' s life: they are about the function of memory itself, its narrative power to create and destroy, sweeten and obliterate the past in the service of the present.
The deep water realm was once assumed to be _______, but we now know that submerged currents of cold water flowing from high latitudes toward the equator may generate high-energy eddies that reshape the seafloor.
The company's chief executive is (i)_______ the desire to postpone action until a consensus has been reached. Instead she makes a brief for instinctive decision making, treating extensive deliberation as something to (ii)_______.
He opens in a style that is notably contentious for a scientific paper, _______ previous works that, in his dim view, have too quickly drawn analogies between human thought and animal thought.
Literary salons and coffeehouses (i)_______ the class-based systems of social hierarchies prevalent at the time. Meritocratic appreciation of wit and brilliance, wherever it might issue, replaced (ii)_______ to establish power.
At its best, the storytelling in this television series manages to accommodate a sense of historical (i)_______. The narrative shows that American independence was not (ii)_______. It was debated. It didn't happen overnight. No one was sure how it would turn out.
The flood of new candidates, including newcomers, party veterans, and the first female candidate, is a startling (i)_______ Japan's (ii)_______ political successions. The crowded field means that the selection of the new prime minister, instead of being the customary (iii)_______, backroom affair, has become a source of intense public excitement.
In the early twentieth century, some _______ the environmental benefits of a motor designed to harness the power of the ocean's waves, pointing out that the motor did not create the smoke or soot associated with burning oil.
In the nineteenth century, the dish known as lobster Newburg was sometimes associated with the culinary accessory known as the chafing dish, but Welsh rarebit was considered the truly _______ chafing dish recipe.
Because carbon is a relatively _______ element, much of the original carbon available to be incorporated in the Earth may have escaped during the accretion of the planet.

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