Answer:

Step-by-step explanation:
Grandma Gertrude gives 13 and Fien gives y.
The total amount of jewelry divided evenly between the 5 sisters:

Nothing further can be done without knowing another value.
Answer:
-6
Step-by-step explanation:

The formula for the volume of pyramid is,

Here, B is base area and height of pyramid.
The volume expression for group 4 is,

Here, expression,

represents the base area and 9 represent the height of pyramid.
So height of the pyramid created by group 4 is 9.
Answer: 9
D doesn’t show a positive or negative correlation. D is the best answer choice.