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In agricultural ecosystems such as sunflower and cranberry plantations,most insect herbivores do not attain outbreak densities, suggesting that they are ______________ natural enemies.
A certain defective printer does not print all $$n$$ pages, where $$n$$ is the total number of pages in a print job, except when $$n=1$$. The printer prints $$\frac{n}{2}$$ pages when $$n$$ is even and $$\frac{n+1}{2}$$ pages when $$n$$ is odd.

Quantity A

The number of pages the printer prints when 7 pages are requested in a print job

Quantity B

The number of pages the printer prints when 8 pages are requested in a print job


What is the sum of the integers from 4 to 120?
$$\frac{4}{3}x+7=11$$

Quantity A

x

Quantity B

2




The figure shows an equilateral triangle that lies insidea square. All of the sides of the triangle and all of the sides of the square have the same length.

Quantity A

The sum of the areas of the shaded regions

Quantity B

The area of the equilateral triangle


k is a positive integer.

Quantity A

The remainder when $$4^k$$ is divided by 11

Quantity B

8


In the xy-plane, the vertices of triangle $$T_n$$, are defined as the points $$(n, 0), (3n+1, 0)$$,and $$(n, 2n^2+2n)$$ for all positive integers n. The perimeter of triangle $$T_5$$ is how much greater than the perimeter of triangle $$T_4$$ ?
In a candy factory, quality-control tests were conducted on six 1,000-piece batches of candy. The numbers of pieces of candy that were rejected in these batches were 4, 3, 8, 6, 3, and 12, respectively. If the median of these numbers is used topredict the number of rejections in each 1,000-piece batch of candy produced by this factory, what is the total number of rejections predicted for 20 such batches?
From a set of 15 questions, a student must select exactly 12 questions to answer. How many different selections of 12 questions are possible if the order in which the questions are selected does not matter?
$$a=-2, b=-3$$, and $$c=0$$

Quantity A

$$a^3b+ac$$

Quantity B

18


$$4^{x-1} > 500$$

Quantity A

x

Quantity B

5


|x|+6 < |y|+7

Quantity A

x

Quantity B

y


Trapezoid RSTU has bases RU and ST. Base RU of trapezoid RSTU is a side of triangie RXU.The height of triangle RXU that corresponds to side RU is greater than the height of trapezoid RSTU that corresponds to bases RU and ST.

Quantity A

The area of the triangle RXT

Quantity B

The area of the trapezoid RSTU


a and b are integers such that 0 < a < b

Quantity A

$$a^2+b^2$$

Quantity B

$$\frac{1}{2} (a+b)^2$$


How many four-digit positive integers are there such that the digits are distinct and have a sum greater than or equal to 29?
How many different five-digit positive integers can be formed in which each of the digits 1, 2, 3, 6, and 7 is used exactly once?
How many different combinations of 5 cards can be chosen from a pack of 52 cards?

Quantity A

The number of different groups of 2 kittens that can be chosen from a litter of 8 kittens

Quantity B

The number of different groups of 6 puppies that can be chosen from a litter of 8 puppies


S={0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

A two-member subset {k, m} of the set S shown above is to be selected at random. What is the probability that the members of the subset will satisfy the equation |k – m| = 2?
If a four-digit number is to be formed from the digits 1, 2, 3, and 4 by selecting each digit at random and using each digit only once, what is the probability that the number formed will be greater than 3,000?

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