Common denominator of 5\12 2\9

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Two lines parallel to a third line are parallel to each other. always sometimes or never

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin