The ratio of 600m to 3km in simplest form

If benito is selecting samples of five values from the table, which row will result in the greatest mean? row 1 row 2 row 3 row 4

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?