Đề thi Olympic Tiếng Anh lớp 11 vòng 16 năm 2013 - 2014

If (a + b)2 = 54 and (a - b)2 = 46, then a2 + b2 = ?

A line is graphed on the coordinate plane above. What is the slope of the line?

There are 15 balls in a box: 8 balls are green, 4 are blue and 3 are white. Then 1 green and 1 blue balls are taken from the box and put away. What is the probability that a blue ball is selected at random from the box?

Simplify the expression above(x ≠ -2).

Given y = (1/2)x², when x is tripled, what happens to the value of y?

What is the slope of the line that passes through the points (5, –1) and (–3, 3)?

What is the vertex of the quadratic function y = –(x – 3)² + 4 ?

Mrs. Morris gave her students the above pattern of white tiles. She asked her students to write an equation to represent the number of white tiles, t, for any figure number, n. Which equation represents the number of white tiles in the pattern?

For which scatter plot would the line of best fit be represented by the equation y = 1/2x + 2?