An arc substends a central angle measuring seven pi over 4 rad what fraction of the circumference is this arc

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%

2x minus y equals 6, x plus y equals negative 3

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?