Need ! the height of the equilateral triangle below is 15 units. what is the value of x?
a) 15 sqrt 3
b)30 sqrt 3
c)15/sqrt 3
d)30/sqrt 3

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

Use sigma notation to represent the following series for 9 terms.

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula