The base of an isosceles triangle is 21 cm long. the altitude to the base is 9 cm long. what is the approximate measure of a base angle of the triangle?

Me! last question, and i'm stuck! write the algebraic expression that models the word phrase. the product of 2 divided by the number h and 8 more than the number k

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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?