Simplify. 57x+27y−2−17x+7

67x+27y−5

47x+27y+5

67xy+5

I don't know.

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.

What is the reflection image of (5,-3) across the line y = -x?

Can someone me out here and the tell me the greatest common factor