79.
{ab==0.1b0.2a++1000780
[1−0.2−0.111000780]
a=1100, b=1000
81.
⎧⎩⎨⎪⎪ltf===0.4t+0.2f+10,0000.5l+0.3t+20,0000.5l+0.05t+0.35f+10,000
⎡⎣⎢⎢1−0.5−0.5−0.40.7−0.05−0.200.6510,00020,00010,000⎤⎦⎥⎥
food, $55,000; transportation, $61,000; labor, $45,400
83. T1=110, T2=140, T3=60
85.
⎧⎩⎨⎪⎪x−x−+yy−zz===70−12050
{(120+z, 50+z, z)}: 0≤z≤130
87. y=2x2−3x+4
89. f(x)=1−32–√2 sin (x)−52 sin (2x)
91. y=−x3+2x2+3x+1
93. f(x)=⎧⎩⎨⎪⎪⎪⎪23x+43, 1≤x≤4−32x+10, 4≤x≤6
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