SOMEONE PLEASEEE HELP WITH MATHHH EXPLANTION NEEDED AS WELL!! TNX

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great