If DE = x + 6, EF = 4x + 4, and DF = 20, what is DE?

12. decide whether each statement is always true, sometimes true, or never true. a. when corresponding points of an original figure and its reflection are connected, the resulting segments are all perpendicular to the line of reflection. b. when a point is reflected over a horizontal line, the y-coordinate of the point stays the same. answer both questions and explain

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.