Evaluate the expression when c =7 and y = -2    -c + 8y

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 vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Explain how you can use the associative property to evaluate (7x50)x4.