81. y=15
83. s=45
85. Maximum height: 1000; the missile hits the ground at x=200.
87. x=≈24.5ft, y≈16.3ft
89.
x=50
91.
P(x)=−31000x2+20.1x−150
3350
C¯¯¯(x)=31000x+3.9+150x
93. $245
95. 62–√ in
97.
36 amp
150Ω
99.
k=1200,000
500 people every day
10,00 or 19,000
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