You are saving to buy a mountain bike that costs $280. each week you save $15. at this rate, how many weeks will it take to have a balance of$100 left to save and an equation

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.