Answer:
4
Step-by-step explanation:
The triangles are similar. So:
=
=
Cross multiply the equation
5(10-x) = 3 x 10
50 - 5x = 30
Move -5x to the right to make it positive and in turn move 30 to the left.
50 - 30 = 5x
5x = 20
x = [tex]\frac{20}{5}[/tex]
x = 4
