#### 题目列表

If $5^{x^{2}-2x}=\frac{1}{5}$, what is the value of x ?
The price x of an item is increased 20 percent.

Quantity A:80 percent of the price of the item after the increase

Quantity B:x

AB and CD are line segments with endpoints on the circle with center O, and z>y.

Quantity A: $\frac{1}{2}$ the length of AB

Quantity B:$\frac{1}{2}$ the length of CD
n is a positive integer and 0< s< 10.

Quantity A:$\frac{1}{n}+\frac{1}{n+s}+\frac{1}{n+10}$

Quantity B:$\frac{3}{n+10}$
In a list consisting of 10 numbers, 5 numbers are greater than 20 and 5 numbers are less than 20.

Quantity A: The median of the numbers in the list

Quantity B:20

The figure consists of two rectangles whose longer sides are all parallel to each other, and x=3.

whose longer sides are all parallel to each other, and . Quantity A:The area of the shaded region

Quantity B:The area of the smaller rectangle
x< 0< y

Quantity A:$\frac{|x|}{|y|}$

Quantity B:$-\frac{x}{y}$
Points R, S, and T are on the number line, and the distance between R and S is greater than the distance between S and T.

Quantity A:RT

Quantity B:RS
Jake, Mary, and Ito took a test in their history class. Jakes score of 68 was the lowest score in the class. Itos score of 85 was 5 less than Marys score. Mary had the highest score in the class. What was the range of all of the scores in the class?

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The driver of a car traveling at a speed of 40 miles per hour had to stop the car quickly. If the drivers reaction time was $\frac{3}{4}$ of a second, approximately how many feet did the car travel during the driver`s reaction time? (1 mile = 5,280 feet)
Of the integers 2, 7, and 49, which, if any, are divisors of  $7^{49}+1$ ?
$a_{1},a_{2},...,a_{n},...$

In the sequence shown, the terms are defined by $a_{n}=(2n-3)^2$ for all positive integers n. If the sum of the first k terms is 11, what is the value of k ?
A new car was sold with new brake linings that were each 0.250 inch thick. After the car had been driven 50,000 miles without replacing any brake linings, the thinnest brake lining was 0.085 inch thick. What was the percent decrease in the thickness of the thinnest brake lining?
Jena has a jar that contains 8 nickels and 12 dimes and no other coins. If she adds nickels to the jar one at a time until the ratio of the number of nickels to the total number of coins in the jar is 4 to 5, how many nickels must she add?
In 1994 the average annual salary of maintenance workers at Company X was approximately what percent of the average annual salary of maintenance workers nationwide in Country A ?
If Company X employed a total of 200 maintenance workers annually for the years 1991 through 1993 and a total of 150 maintenance workers annually for the years 1994 through 1997, what was the average amount of money spent annually by Company X on the salaries of its maintenance workers for the years 1991 through 1997 ?
For the years 1991 through 1997, what was the ratio of the range of the average annual salaries of maintenance workers at Company X to the range of those nationwide in Country A ?
In the xy-plane, the graph of y=(2x+3)(x-5) crosses the y-axis at the point (0,k). What is the value of k ?

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A, F, M, P, Y

If the 5 letters listed above were randomly ordered, what is the probability that the resulting list would be either in alphabetical order (as shown) or in reverse alphabetical order?
When positive integer n is divided by 4, the remainder is 2. When n is divided by 3, the remainder is 1. Which of the following statements must be true?

Indicate all such statements.

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