Which quadratic regression equation best fits the data set?

A.

Step-by-step explanation:

We are given the table,

x                             y

1                            20.4

2                           60.5

3                           86.8

4                           122.4

5                           180.4

6                           241.2

7                           420.8

Using the regression calculator, we get that,

So, option A is correct.

it would open into a square depending on the type of envelope i’m not sure about the second part

i think the length is 12 and the width is 17