What single discount is equivalent to successive discounts of 10% and 20%

What signals you that factoring by grouping is the best method to use when factoring a problem?

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

The value of cos 30° is the same as which of the following?