Đề thi Olympic Tiếng Anh lớp 9 vòng 35

Simplify: 

A rectangular field is 300 feet wide and 400 feet long. Random sampling indicates that there are, on the average, three ants per square inch throughout the field. Of the following, the number that most closely approximates the number of ants in the field is

If f(x) = 2x + 1 and g(x) = x³, what is f(g(3))?

In which direction does the graph of y = (x + 2)^0.5 + c shift as c decreases?

x + y - z = -5
2x + z + z = -2y
x - y = 3z + 3

What is the value of z in the solution of the system above?

What is the domain of f (x) = -2x³ + x² + 1?

The population of a small town in North Carolina is 4,000, and it has a growth rate of 3% per year. Which expression can be used to calculate the town's population x years from now?

The graph of f (x) = x² + 3 is translated to produce the graph of g(x) = (x + 2)² + 3. In which direction was the graph of f translated?

Solve for x: 

Which graph shows the solution set for the inequality x² > x +12?