Answer:
Step-by-step explanation:
By geometric mean theorem:

For this case we have the following data:


So that the figure can be a rectangle, its diagonals must be equal, that is, 
In this way we have:

Clearing x we have:


Thus, x must be equal to 10 so that the figure is a rectangle.
Answer:

Option A
Answer:2
x
+
3
y
=
6
Step-by-step explanation:
in standard form
20/2-10/5. You divide 20 by 2 and subtract that from 10 divided by 5