PLEASE HELP IM SO CONFUSEDDD

Answer:
x = 30
Step-by-step explanation:
The figures are similar, thus the ratios of corresponding sides are equal, that is
[tex]\frac{x}{18}[/tex] = [tex]\frac{45}{27}[/tex] ( cross- multiply )
27x = 810 ( divide both sides by 27 )
x = 30