Đề thi Olympic Tiếng Anh lớp 9 vòng 29 năm 2013 - 2014

At a certain time of day, a 2-meter stick casts a shadow 0.5 meter long. If s is the length of the shadow cast by a different object at the same time of day, which expression represents the estimated height of the object?

Which graph represents the solution to the inequality -4y > 2x + 4?

The slope of a line is -1. The line contains the point (16, 0). Which of the following are the coordinates of another point on the line?

A waiter uses the equation y = 500 + 0.15x to estimate the amount of money, y, in dollars, he will earn in a month if his customers spend a total of x dollars. One month, the waiter expects that his customers will spend $1000 more than his customers spent the previous month. How much more money does he expect to earn compared with what he earned in the previous month?

Figure Q is the image of Figure P after a single reflection. Over which line was Figure P reflected?

Ms. Gomes earns a free airplane flight after flying 25,000 miles. So far, she has flown 9,221 miles. After flying 2,800 miles on her next trip, which percent best estimates how many miles Ms. Gomes will have toward a free trip?

The quadrilateral above is a rhombus. What is the perimeter of the rhombus?

Which object is represented be the following net?

Juan made the first three figures of a pattern. Which function represents the number of dots, f(n), in figure n?