The standard deviation of test scores on a certain achievement test is 11.3. if a randomsample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimatefor the average score of all students.

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

What is the approximate circumference of the circle shown below?

Eight people were asked what the balance of their savings account at the beginning of the month was and how much it increased or decreased by the end of the month. create a scatter plot that represents the data that is shown in the table. the x-axis represents the beginning balance in thousands of dollars and the y-axis represents the change in the savings account in hundreds of dollars. name beginning balance (in thousands of dollars) change in savings account (in hundreds of dollars) jimmy 5 3 kendra 4 7 carlos 5 4 yolanda 3 1 shawn 2 5 laura 3 2 andy 5 6 georgia 4 3