Mary is in n years old. How old she be 12 years? How old was she 4 years ago

For the given quadratic equation convert into vertex form, find the vertex and find the value for x=6 y=-2x^2+2x+2

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.

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !