A firm has two plants that produce identical output. The cost functions are Upper C 1 equals 309 q minus 8 q squared plus 0.5 q cubed and Upper C 2 equals 309 q minus 14 q squared plus 1.0 q cubed. First, note that if AC 1equals309minus8qplus0.5q squared, then StartFraction dAC 1 Over dq EndFraction equals negative 8 plus 2 (0.5 )q . Similarly, if AC 2equals309minus14qplus1.0q squared, then StartFraction dAC 2 Over dq EndFraction equals negative 14 plus 2 (1.0 )q . At what output level does the average cost curve of each plant reach its minimum? The first plant reaches minimum average cost at nothing units of output. (E