Answer: 42.3 ft
Step-by-step explanation:
Draw a picture (see attachment)
Given: angle = 25°, hypotenuse = 100, opposite = ???
[tex]\sin\theta=\dfrac{opposite}{hypotenuse}\quad \rightarrow \quad \sin25^o=\dfrac{y}{100}\quad \rightarrow \quad 100\ \sin 25^o=y\\[/tex]
[tex]\large\boxed{42.3\ ft}=y[/tex]