Which expression is equivalent to startroot negative 108 endroot minus startroot negative 3 endroot?

What is the value of the expression below? (81^2)^1/8

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.