Find the missing length indicated. Leave your answer in simplest radical form. Please help due today!!

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )