Đề luyện thi Olympic Tiếng Anh lớp 11 vòng 9

In the diagram above, parallelogram ABCD has diagonals AC and BD that intersect at point E. Which expression is not always true?

Which transformation of the graph of y = x² would result in the graph of y = x² + 2?

The volume, in cubic centimeters, of a sphere whose diameter is 6 centimeters is

In rhombus ABCD, the diagonals AC and BD intersect at E.If AE = 5 and BE = 12, what is the length of AB?

In the diagram above of circle O, PA is tangent to circle O at A, and PBC is a secant with points B and C on the circle. If PA = 8 and PB = 4, what is the length of BC?

Which graph shows that soil permeability varies inversely to runoff?

On a standardized test, a score of 86 falls exactly 1.5 standard deviations below the mean. If the standard deviation for the test is 2, what is the mean score for this test?

Lines m and n intersect at point A. Line k is perpendicular to both lines m and n at point A. Which statement must be true?

In △DEF, m∠D = 3x + 5, m∠E = 4x − 15, and m∠F = 2x + 10. Which statement is true?

As shown in the diagram above, △ABC is similar to △DEF, AB = 7x, BC = 4, DE = 7, and EF = x. What is the length of AB?