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Although the use of cameras to study animal behavior was certainly not ____________, cameras were nevertheless not used to study individual frogs in their natural habitat until 2009.
Experiments and field observations show that in a Mediterranean plant community, drought has a counterintuitively positive effect on shrub seedling establishment. Due to decreased competition by annuals, droughts increase opportunities for shrub seedlings. Under nondrought conditions, annuals competed with shrub seedlings more effectively, confirming the experimenters' assumption that annuals benefit more than shrub seedlings from an increase in water availability. This may be attributed to their faster or more efficient uptake of soil resources. Similar patterns can be observed in other semi-arid communities. Jurena and Archer showed for a savanna community that root biomass of grasses increased in wetter conditions, decreasing grassland susceptibility to encroachment by shrub seedlings.
It can be inferred from the passage that the "positive effect" occurs because
The average (arithmetic mean) price of 8 used books is $1.55.

Quantity A

The total price of n of the 8 books (n > 0)

Quantity B

($1.55)n




$$\frac{2y-5}{6}$$ - $$\frac{y-7}{3}$$=


A homeowner wants to pour concrete for a new patio and walkway according to the layout shown above. If the concrete is to be $$\frac{1}{3}$$ foot thick, how many cubic feet of concrete will be needed to form the patio and walkway?
Two seating arrangements of people around a circular table are called the same if, for each seated person, the same person is seated to that person's immediate right in both arrangements.

Quantity A

The number of different seating arrangements of 4 people around a circular table

Quantity B

8


Computational psychologists, since they take the operation of a computer as a model, ____________ concepts from computer science to explain what the mind is and how it works.
The original price of a certain musical instrument was 25 percent, or $150, greater than the discounted price. What was the original price of the instrument?
In the xy-plane, the graph of an equation is symmetric with respect to the y-axis if for every point (a, b) on the graph, the point (-a, b) is also on the graph. Which of the following equations have a graph in the xy-plane that is symmetric with respect to the y-axis?

Indicate ALL such equations.
Although boredom is ____________, recent research indicates that excessive amounts of it can be harmful to health.
Contrary to what might be expected, having numerous relationships is not necessarily a________loneliness since loneliness is determined by the way people experience relationships subjectively.
The explanation of tornado formation according to which tornadoes form during a twisting clash of air masses is clearly(i)________: such clashes occur very frequently both in the United States and in countries where tornadoes are(ii) ________.
For every________reader of Vestiges there were many more who became vocal critics, and the book aroused heated opposition from a broad range of British society.
The essays in this collection, which explore the adaptation of literary texts to film, all (i)________ the view that the fidelity of film adaptations to their literary precursors is(ii) ________. In fact, the authors of these essays broadly concur that an emphasis on fidelity in film adaptations can be traced to an outmoded academic ideology that insistently prizes the literary in a way that(iii)________ the value of the cinematic.
The harmonic mean of two positive numbers is the reciprocal of the average (arithmetic mean) of their reciprocals. The harmonic mean of 10 and 20 is closest to which of the following?
The standard deviation of $$n$$ numbers $$x_{1}$$, $$x_{2}$$, $$x_{3}$$,......, $$x_{n}$$, with mean $$\overline{x}$$ is equal to $$\sqrt{\frac{s}{n}}$$, where $$S$$ is the sum of the squared differences $$(x_{i} - \overline{x})^{2}$$ for 1 ≤ i ≤ n.

For what value of $$x$$ is the standard deviation of the numbers $$6$$, $$14$$, $$16$$, and $$x$$ least?
As a result of a chemical reaction between compounds A and B. $$\frac{1}{4}$$ of each compound was transformed into an equal amount of the other compound, while the remaining $$\frac{3}{4}$$ of each compound was not transformed. If the amount of B was initially 4 times the amount of A. what was the ratio of the amount of A to the amount of B after the reaction?
For a certain type of can, the number of grams of aluminum per can decreased by 20 percent from 1994 to 1998, while the cost per gram of aluminum decreased by 60 percent. If the cost of the aluminum in $$y$$ cans in 1994 was equal to the cost of aluminum in $$ky$$ cans in 1998, then $$k$$=?


Each morning Betty walks from intersection P to intersection R, always walking along streets shown in the figure above and always going east or north. If she varies her walks as much as possible, taking every different path in turn before repeating the sequence of paths, on how many mornings in 48 consecutive mornings will Betty walk through intersection Q?

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