That was said oddly. From what I understand, she would need to buy 64 feet of fabric.
Answer:

Step-by-step explanation:
(7 , -1) = (x1 , y1)
(9 , -9) = (x2 , y2)
distance formula = 
=
=
=
=
=
The n-th term is given by

Then we can find the common ratio from the given terms.

The appropriate choice is -1.
1 6/7 - 3/4...
if the sum of her answer and 3/4 is 1, evelyn's answer is too low
if the sum of her answer and 3/4 is 1 and 6/7, evelyn's answer is correct
if her answer is -3/4 and 1 and 6/7, her answer is too high
I need to see a photo of the graph to choose the correct answer