Đề thi Olympic Tiếng Anh lớp 11 vòng 10 năm 2013 - 2014

If the vertex angles of two isosceles triangles are congruent, then the triangles must be

The principal would like to assemble a committee of 8 students from the 15-member student council. How many different committees can be chosen?

An amateur bowler calculated his bowling average for the season. If the data are normally distributed, about how many of his 50 games were within one standard deviation of the mean?

Which quadrilateral has diagonals that always bisect its angles and also bisect each other?

In the diagram above of right triangle ABC, altitude BD is drawn to hypotenuse AC, AC = 16, and CD = 7. What is the length of BD?

The roots of the equation 9x² + 3x − 4 = 0 are

In △ABC, a = 3, b = 5, and c = 7. What is m∠C?

Look at this number line. If point P represents √x, which point is closest to the value of x?

A man wants to place a new bird bath in his yard so that it is 30 feet from a fence, f, and also 10 feet from a light pole, P. As shown in the diagram above, the light pole is 35 feet away from the fence. How many locations are possible for the bird bath?

Renata is a sales representative for a printer company. She sells two models of printers— Model P and Model Q. If Renata is paid a $25 commission for every Model P printer sold and a $20 commission for every Model Q printer sold, what was her total commission last month?