Answer:
16
Step-by-step explanation:
To solve, we can use an equation finding the average of the siblings'ages.

Answer:
55
Step-by-step explanation:
CE is a bisector so DE has the same measure as BE.
Answer:
2 x 20^2
Step-by-step explanation:
I did it on paper and looked it up to make sure
Answer:
8 < X < 12
Step-by-step explanation:
12 is the measure of the longest side & 8 is the measure of the smallest side. So just arrange it in ascending order.