Đề thi Olympic Tiếng Anh lớp 9 vòng 20 năm 2013 - 2014

The box-and-whisker plot above shows Robert's phone calls for one month. Based on the plot, which statement about the length of a phone call that Robert made last month is most likely true?

Haley is planning a garden shaped like a right triangle with the dimensions shown above. How much fencing will she need to enclose the garden?

Which is the greatest common factor of the three terms: 32a³b², 36a²c², 16ab³?

Which of the following systems of linear equations are neither parallel nor perpendicular?

The table displays the average number of pounds of milk and milk fat produced per cow in seven states in 2001. In North Carolina in 2001, the production of milk per cow was 17,200 pounds. According to the line of best fit for the data above, approximately how many pounds of milk fat were produced per cow in North Carolina?

Mr. Hanson recorded the typing speeds (in words per minute) of 25 students and their weeks of experience. The line of best fit for the data is y = 4.4x + 18.9, where x is the number of weeks of experience of a student and y is the student's typing speed. What is the meaning of the y-intercept for this set of data?

Martha has $180. She needs a total of $2,000 to start an account. She earns $60 per day working, of which she saves $50. Which equation can she use to determine the number of days, d, she needs to work to reach her goal of $2,000?

Maria sells paintings in an art gallery. She earns $375 each week plus a commission equal to 2.5% of her sales. This week her goal is to earn at least $500. What is the minimum amount of sales she must have this week to achieve her goal?

For the line graphed, the x-intercept is changed to -2 and the slope is unchanged. How will the graph of the line change?

Solve: x² - 7x + 10 = 28