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$$\frac{1}{a}$$ +$$\frac{1}{b}$$ =$$\frac{1}{c}$$, a+b=20, a, b, c are all positive. The value of c could be?

Indicate all such values.
The total amount that Mary paid for a book was equal to the price of the book plus a sales tax that was 4 percent of the price of the book. Mary paid for the book with a $10 bill and received the correct change, which was less than $3.00. Which of the following statements must be true?

Indicate all such statements.
20 boys and 40 girls are in Group A, while at least 7 boys, together with some girls are in Group B. To choose one person from each of the group, the probability that both are boys is no greater than $$\frac{1}{15}$$. Which of the following statements must be true?

Indicate all such statements.
If f(x)=2x+1, g(x)=2f(x)+1, then what is the value of g(2)?


The figure above shows the graph of the function f in the xy-plane. What it the value of f(f(-1))?


Which of the following functions f defined for all numbers x has the property that f(-x)=-f(x)?
a is the sum of the second and third positive integer multiples of a.

Quantity A

5

Quantity B

15




(77△56)△81=?
How many points (x, y) lie on the line segment between (22, $$\frac{38}{3}$$) and (7, $$\frac{53}{3}$$) such that x and y are both integers?
Line l passes through points in both quadrants II and III. Which of the following statements are true?

Indicate all such statements.
The coordinates of three points in an x-y rectangular coordinate system are (0,3), (3,3b) and (b,3) respectively (b is a constant). If the area of the triangle is 18 when connecting the three coordinates, then b equals?

Indicate all such possible values.
A rectangle is drawn in a standard xy-coordinate plane. If the sides of the rectangle are not parallel to the axes, what is the product of the slope of the four sides?
In the xy-plane, a line with equation y=mx+b, where m and b are constants and mb≠0, has a y-intercept that is twice the x-intercept.

Quantity A

m

Quantity B

-2


What is the y-intercept of the graph of the equation y=2·|4x-4|-10?
In the xy-plane, line k is a line that does not pass though the origin. Which of the following statements individually provide(s) sufficient additional information to determine whether the slope of line k is negative?

Indicate all such statements.
f(x)=($$x^{2}$$-x)(x-2)

Quantity A

The sum of all the x-intercepts of f(x)

Quantity B

2


In a circle, the center lies on the Point (-5, 2), while Point (6, 4) lies on the circle. What`s the diameter of the circle?
The distance between point (a, 2) and point (b, 6) is 5.

Quantity A: |a-b|

Quantity B: 3
In a circle, the center lies on the Point (4, 6). If SR is a diameter, Point S (6, 8) and Point R lie on the circle, then what`s the y-coordinate of Point R?


Parallelogram OPQR lies in the xy-plane, as shown in the figure above. The coordinates of point P are (2, 4) and the coordinates of points Q are (8, 6). What are the coordinates of point R?

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