Đề thi Olympic Tiếng Anh lớp 9 vòng 5 năm 2013 - 2014

A diagram is shown. Which angle must be congruent to ∠AGB?

The cost of renting a boat is $20 plus $2.50 per hour, where x is the number of hours of boat rental. Millie wants to spend less than $50 on the boat rental. Which inequality models this situation?

Iodine 131 is a radioactive substance with a half-life of 8 days. With an initial quantity of 2,400 grams, the chart above shows its decay over a period of days. By extending the sequence, what is the total amount left after 56 days?

What is the distance between -4 and 7 on a number line?

A 6-foot man standing next to a flagpole casts an 8-foot shadow. At the same time, the flagpole casts a shadow of 40 feet. What is the height of the flagpole? (Round to the nearest whole number.)

Diagonal Lane crosses Maple Court and Oak Street, which are parallel as shown in the figure above. Which intersection angles must be congruent to ∠A?

Paco's baseball team traveled from Anchorage, Alaska, to Denver, Colorado, to play in a tournament. When it is 10:00 AM in Anchorage, it is 12:00 noon in Denver. Paco's baseball game started at 1:00 PM, Denver time, and lasted 3 hours. What time was it in Anchorage when Paco's baseball game ended?

Which 3-dimensional shape can be formed from the net above?

Two trapezoid-shaped tabletops are congruent to each other. trapezoid FGHI ≌ trapezoid WXYZ. Which side of trapezoid WXYZ must be congruent to GH?

A model of a building is in the shape of a cube with a square pyramid on top. Each edge of the cube is 3 inches, and the square pyramid is 2 inches high with a 3-inch-by-3-inch base. What is the volume of the model in cubic inches?