77.
≈550 ft
≈140 ft
547 ft; 139 ft
79. 19
81. 25
83. Square with 20-unit sides; maximum area: 400 square units
85. Dimensions: 75 m×100 m; area: 7500 m2
87. 38
89. 28 students; maximum revenue: $1568
91.
h(t)=−0.8t2+8t+5 (meters)
5 sec
93.
64 ft
After 4 sec
95. Dimensions of the rectangle: height=18π+4ft; width=36π+4ft
97.
(59, 36.81)
120 ft
37 ft
9 ft
113.6 ft
99.
f(x)=0.029(x−3.79)2+1.09
At x=3.79≈4(year 2010), which fits the original data
f(5)=1.14 million
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