MATH trigonometric ratios need help

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

You make a necklace using blue, purple, and green beads in a ration of 1: 1: 2. you use the total of 168 beads. how many green beads in the necklace?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 0.45, a standard deviation of 0.001, and margin of error of 0.5% a)0.44 b)0.46 c)0.45