A family is taking a picture, with everyone in the family standing in a row. In the family, there are two sets of twins. In how many ways can the 9 people in the family be arranged such that nobody is sitting next to their twin?

Mercury poisoning is dangerous overload of mercury within the body. a major source of mercury within the body, a major source of mercury poisoning is consuming fish that contain mercury. certain fish are more prone to having higher levels of mercury than others. the pie chart shows the distribution of four breeds of fish at a hatchery. the hatchery has approximately 6,000 fish. a biologist from the centers for disease control and prevention randomly test 5% of each breed of fish for mercury content. her findings are shown in the following table. based on the biologist's findings, if a single salmon is randomly selected from those that were tested, what is the probability that this particular fish would have a dangerous mercury level? a) 0.001 b) 0.004 c) 0.02 d) 0.08

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Pls will give brainliest and all p. s u can zoom in if u cant see plss