Đề thi Olympic Tiếng Anh lớp 9 vòng 21 năm 2013 - 2014

Câu 1

Pipe A can fill a tank in 8 hours. When both pipe A and pipe B are used, the tank is filled in 5 hours. How long, in hours, would it take pipe B alone to fill the tank?

Câu 2

Jack and Jill sat at the ends of an 18-foot long seesaw where the fulcrum was placed in the middle of the board. By placing a 20-pound weight 3 feet in front of Jill, they were in bal-ance. If Jack weighs 140 pounds, which equation could be used to determine Jill's weight (x) in pounds?

Câu 3

When the expression above is simplified, the numerator is: 

Câu 4

Solve for t in the expression above.

Câu 5

What is the value of c if x² + 7x + c is a perfect square?

Câu 6

The figure shows the graph of y = x² – 2x – 3. The expression x² – 2x – 3 is less than zero when:

Câu 7

The vertex of the parabola represented by y = x2 + 8x + 13 is in which quadrant?

Câu 8

The shaded region above is determined by which pair of inequalities?

Câu 9

Which of the following is an equation for line m?

Câu 10

Two planes intersect at line AB. Each plane contains a line that does not intersect AB. Which of the following terms describes the relationship between these two lines?