Of two planes intersect is their intersection a point

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.

Solve 2x+y=3 x+y=5 in substitution method

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68