#### 题目列表

When a stuff drops from a certain altitude, if the distance between it and the ground is H and the time it has been dropping is t, H and t satisfy an equation: H=8-4.9$t^{2}$. Then how long will it need to hit the ground?

The operation @ is defined for all numbers x and y by the equation x@y=$x^{2}$+y

#### Quantity A

($\frac{2}{3}$@$\frac{2}{3}$)@$\frac{2}{3}$

#### Quantity B

$\frac{2}{3}$@($\frac{2}{3}$@$\frac{2}{3}$)

Define x@=$(x-1)^{2}$

(x+1)@

#### Quantity B

$x^{2}$

If a#b=$\frac{a}{b}-\frac{b}{a}$, which of the following must be true?

Indicate all such statements.

c@3, where c > 3

#### Quantity B

3 In the xy-plane, line m can be represented by y=kx+b. If x is increased by 1, then y will be increased by 4. Which of the following could be the representation of line m?

Indicate all such expressions.
In the xy-plane, line m passes through (0, b) and (3b, 0), where b≠0

#### Quantity A

The slope of the line m

#### Quantity B

-$\frac{1}{2}$

Line I passes through point A (5,4) and the origin.

#### Quantity A

The slope of line L

#### Quantity B

$\frac{4}{5}$

In the xy-plane, (0, 0) and (4, b) is on the line m.

#### Quantity A

The slope of the line m

#### Quantity B

$\frac{1}{2}$

The x-intercept of line l is -2/3,and the y-intercept of line l is $\frac{3}{4}$.

#### Quantity A

The slope of the line l

#### Quantity B

$\frac{10}{9}$

In the xy-plane,the slope of line l is 1/2.

#### Quantity A

The slope of line m that is perpendicular with line l

#### Quantity B

-1

In the xy-plane,point A(3,x) and B(9,2) are on the line m. If the slope of line m is -$\frac{10}{3}$,what is the value of x?
g(x)=2h(x),and x-intercept of h(x)is 3, what is x-intercept of g(x)?
The slope of line I is 2 and its x-intercept is positive. Which of the following line MUST have an intersection with line I above the x-axis?

Indicate all such items.
In the xy-plane,line I can be represented by y=mx+6,and 3≤m≤4,which of the following could be the x-intercept of line I?

Indicate all such values.

#### Quantity A

The distance between the origin and (x, y)

#### Quantity B

The distance between the origin and(1-x,1-y)

In the xy-plane,point A(2,1) is on the circle with center O(-2,-1).What is the circumference of the circle?

Which two of the following inequalities contain points inside the shaded area shown above?

Select two of the following inequalities. The x-intercept and the y-intercept of a line are -4 and 6 respectively. Which of the following points are below the line?

Indicate all such items.
In the x-y plane, the point(r,s)is on the line y=$x^{2}$+1, the point(r,t)is on the line y=$x^{2}$-1.

s

#### Quantity B

t

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