Unit 4 congruent triangles homework 6 congruent triangle proofs ASA, AAS and HL PLEASE HELP ME!!!

Me find the missing dimension of a triangle height: 7 in., area: 21^2

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

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?