How to determine the limits of a 90% confidence interval estimate for population proportion

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

The solution set for 5v2 – 125 = 0 is

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay