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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?

Give your answer to the nearest tenths.
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@=$$(x-1)^{2}$$

Quantity A

(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.


Quantity A

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?

Give your answer to the nearest 0.1.


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.

Quantity A

s

Quantity B

t


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