30. The dotted line from which the 30° angle is measured is parallel to the ground, so the angle of elevation from the corn field to the airplane is also 30°. SOH CAH TOA tells you
tan(30°) = (2400 ft)/(horizontal distance)
Solving for horizontal distance gives you
(horizontal distance) = (2400 ft)/tan(30°) = (2400/((√3)/2)) ft ≈ 4157 ft
The appropriate choice is
H 4157 ft
31. You want the savings as a percentage of the original price. The numerator of the fraction will be the savings: (4100 - 3450). The denominator of the fraction will be the original price: (4100). The computation will look like ...
D
