On​ Monday, a museum had 400 visitors. On​ Tuesday, it had 780 visitors. Estimate the percent change in the number of visitors to the museum. Use pencil and paper. Estimate how many people would have to visit the museum on Wednesday to have the same estimated percent change between Tuesday and Wednesday as between Monday and Tuesday. Explain your answer. Which of these is the best estimate for the percent change in the number of visitors to the​ museum?
A.50% decrease
B. 25% increase
C. 75% decrease
D. 100% increase

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

2÷6+1/2 to the second power plus one

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)