Solve with elimination:
10a + 4b = 18
7a + 14 = b
solve for b

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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%