What is the value of 238 - 3x^2 when x=4? ?

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.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Which ordered pair is a solution of the equation? 2x+3y=10