Elena is saving money for a new laptop. She started with some money in her savings account and adds a fixed amount each week. The total amount of money, , in dollars, in her account after weeks is modeled by the equation . What does the number 150 represent in this equation?
The amount Elena saves each week.
The total amount Elena has saved after 150 weeks.
The initial amount of money Elena had in her savings account.
The cost of the new laptop.
