Two lines that are perpendicular to each other form 4 right angles. true or false?

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

Acircle has a circumference of 28.36 units what is the diameter of the circle

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15