Which postulate, if any can be used to prove the triangles congruent

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.

How can you construct perpendicular lines and prove theorems about perpendicular lines

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.