Solve for the brainlist

x = 10.0

Step-by-step explanation:

Using the geometric mean formula:

       x                projection

 =  

entire base              x

Here, the projection is 5 and the entire base is (20 + 5). So:

       x                5

 =  

      25              x

Cross multiply:

x² = 25 (5)

x² = 100

√x² = √100

x = 10

part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.