Answer:
16.8
Step-by-step explanation:
Assuming the triangles are similar, write a proportion to find x.
[tex]\frac{20}{30}=\frac{28-x}{x}[/tex]
Cross multiply the numerator and denominator of each fraction.
20x=30(28-x)
20x = 840 - 30x
50x = 840
x = 16.8
