Please help me i’ll give u a brainliest

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55