Answer:
152.21 average variable cost
Explanation:
I'll assume that TC is Total Cost and Q is unit quantity.
TC=175+48Q+5Q²
The fixed cost is 175. Even at 0 units, the total cost will be 175.
Lets find the total cost for 19 units: (Q = 19)
TC=175+48(19)+5(19)²
TC=175+912+1805
TC = 2892
Since 19 units are produced for a total cost of 2892, we can divided the two to obtain an average variable cost:
(2892)/19 = 152.21 average variable cost