What is the value of the x variable in the solution to the following system of equations?
2x + 3y = 4
x - 2y = -5
2
-2
1
-1

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.