Sandy ran 6 km, and Marisa ran 3.5 km.
6 + 3.5 = 9.5
I really hope this helped you out! c:
Answer:

Step-by-step explanation:
Give that:
the surface equation is 
from the family of traces in x = n given that
, the equation can be represented as :


This represents a family of hyperbola for all values of n expects that n = ± 1
So, if n = ± 1,
Then

(y-z) (y+z) = 0
y = ± z
So, for n = ± 1, it is a pair of line for y = z, y = -z
You multiply the GCF of the numerical part 3 and the GCF of the variable part x^2y to get 3x^2y
The answer is 7, hope it’s right