#### 题目列表

The estimated number of on-line shoppers for 1996 is approximately what percent of the estimated number for 2001?
For 1998, if the total amount of online sales was 6.0 billion dollars, which of the following is closest to the average estimated amount spent per on-line shopper? (1 billion = 1,000 million)
From 2001 to 2002 the percent increase in the estimated number of on-line shoppers is approximately which of the following?
On a 60-question true-false test, Marcy answered correctly all questions she understood, and she guessed randomly on all questions she did not understand. She answered 52 questions correctly on the test. How many questions did Marcy most likely understand?
If 15 ≤ r ≤ 18 and 30 ≤ s ≤ 36, what is the greatest possible value of the average (arithmetic mean) of $\frac{1}{r}$ and $\frac{1}{s}$?

In the figure, what are the coordinates of point A?
Which of the following is equivalent to $(\frac{1}{3})^{-2}$+ $(\frac{1}{4})^{-2}$?
35 < 5y < 50

12 < y+6 < 15

y

#### Quantity B

8

A circle has an arc of length 16, which is 20 percent of the circumference of the circle.

#### Quantity A

The area of the circle

#### Quantity B

$\frac{1600}{π}$

The figure shows a black and white square tile from a ballroom floor. Both of the black sections are squares, and x > y

#### Quantity A

The ratio of the sum of the areas of the black sections to the sum of the areas of the white sections

#### Quantity B

$\frac{x}{y}$

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

The probabilities that independent events A and B will occur tomorrow are 0.60 and 0.80, respectively.

#### Quantity A

The probability that A or B or both will occur tomorrow

0.92

#### Quantity A

$\frac{2^{27}-2^{24}}{8^{27}-8^{26}}$

#### Quantity B

$2^{-54}$

If DC=x in the figure above, what is the perimeter of triangle ABD in terms of x?
If N is a positive integer, then the number of prime numbers between N+1 and N+6, inclusive, CANNOT be
On the number line, which of the following represents the solution set of the inequality $x^{2}- 5x+6 ≤ 0$?

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?
Today is Willy and Jake's birthday. Willy is 6 years older than Jake. On their birthday 4 years from today, Willy's age will be twice Jake's age. What will Jake's age be on his birthday 4 years from today?

_____years

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