Writing to Explain: Lucas is saving for a guided backpacking trip in Yosemite. A three-day backpacking trip will cost $840. Lucas plans to save $60 each week for the trip. If x equals the number of weeks, write an expression that describes the amount of money Lucas still needs to save after x weeks. Make a table to show how much Lucas still needs to save after x = 3 weeks, x = 5 weeks, x = 7 weeks, and x = 12 weeks.Explain how you chose the labels
for your table.