What property is this: 2 • 7 • 2 • 1 = (2 • 7) • (2 • 1)

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.

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Which expression is equivalent to -5(3x - 6/7)