Answer:
10
Step-by-step explanation:
Determinant = ad - bc

Cost of the article = $27.50
Amount of city sales tax = (27.50 x 6%) = $1.65
Amount of excise tax = (27.50 x 8%) = $2.20
From my knowledge, we pay city sales tax and federal excise tax when we buy something, so the total cost would be $31.35
The third answer option is correct. sqrt(x) = x^(1/2). So sqrt(121) = 121^(1/2).