A new truck that sells for 28000 depreciates (decreases in value) 13 each year. What is the decay factor b?

To find the decay factor ( b ) for the truck's value, you can use the formula for depreciation. Since the truck depreciates by 13% each year, the value remaining after one year is ( 100% - 13% = 87% ) of its original value. This means the decay factor ( b ) is ( 0.87 ). Therefore, the value of the truck after each year can be calculated by multiplying the previous year's value by ( 0.87 ).