Which expression is equivalent to 2a +1 / 10a -5 divided by 10a / 4a^2 -1?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

More than 450450 students traveled to a state park for a field trip. the school allowed 66 students to travel by car, and the rest traveled on 1111 buses, each of which held the same number of students. if there were ss students in each bus, which inequality best represents this situation?