Which expression is equivalent to this polynomial explession? (2x2 – 3y2) 414 + 6r2y2 + 9y4)

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.

For the equations below which statement is true ?

Twelve less than a number is at most 20