Đề thi Olympic Tiếng Anh lớp 9 vòng 22 năm 2013 - 2014

6x + y = 9.7
4x + 2y = 9.8

Given the system of equations, what is the value of x?

Simplify: (2x⁰y)(-3xy⁵)

The cost of mailing a box varies directly with the weight of the box in pounds. It costs $8 to mail a 5-pound box. How much would it cost to mail a 12-pound box?

Which expression is equivalent to (x + 3)(3x² - 4x -5)?

The first term of a pattern is 7. Each term in the pattern is formed by subtracting 2 from the previous term. What is the fifth term of the pattern?

The endpoints of GH are G(-3, 7) and H(2, 9). What are the coordinates of the midpoint of GH?

Which is an equation of a line that is parallel to MN?

If 3x² = 48, which integer could be a value of x?

A plane cuts through a rectangular prism as shown in the figure above. Which of the following describes the shape created by the cross section?

Gwen needs 9/4 cups of flour to bake 3 dozen cookies. How much flour does Gwen need to bake 5 dozen cookies?