Đề thi Olympic Tiếng Anh lớp 9 vòng 27 năm 2013 - 2014

What is the length of EF?

On a map of downtown, 12th Street is perpendicular to Avenue J. The equation y = -4x + 3 represents 12th Street. What is the equation representing Avenue J if it passes through the point (8, 16)?

The recipe for a salad is above. If the recipe makes 6 servings of salad, about how many calories are in 1 serving?

After flying at a constant altitude, an airplane descends toward an airport. The equation a = 5500 – 600t shows the altitude, a, in feet, of the airplane t minutes after it began to descend. According to this equation, which statement is true?

Study the triangles on the coordinate plane above. Which transformation can be applied so that triangle U is the image of triangle T?

The table shows the costs for visits of different lengths by cleaning companies in a town. The length of a visit is represented by x, and the cost of a visit is represented by y. Each cleaning company charges a flat fee for visiting the house or apartment and an hourly rate. The equation of the line of best fit for the data is y = 16.8x + 40.5. What does the y-intercept represent?

An amusement park charges $15 to enter the park and an additional fee for each time a guest rides a roller coaster. Susan rode 6 times on a roller coaster. Her total payment was $33. Maria rode 11 times on a roller coaster. What was her total payment?

Which equation describes the function?

Carol has three times as many 10-dollar bills as 5-dollar bills. She has a total of $350. How many 5-dollar bills does Carol have?

In 2000 Jim planted a tree that was 9/2 feet tall. In 2005 the tree was 63/4 feet tall. Assuming the growth of the tree is linear, what was the rate of growth of the tree?