Chapter 13, Trigonometric Ratios and Functions - 13.2 Define General Angles and Use Radian Measure - 13.2 Exercises - Quiz for Lessons 13.1 and 13.2 - Page 865: 12

See below

The hypotenuse represents the length which is 152ft, and the opposite side to the 30 degree angle represents the height. We have $\sin \theta=\frac{h}{l}\\\sin 30=\frac{h}{152}\\\sin 30 \times 152=h\\h=\frac{1}{2}\times152\\h=76$