Quantitive relationships

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate. true or false?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume