The sum of 3 consecutive odd numbers is 87. what is the smallest of the 3 numbers?

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.

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale