The landscaper pours 175 gallons of herbicide in a pond. The herbicide degrades 15% each week. Write an equation to find the amount of herbicide in any given week. y =  ( )t, t = number of weeks How much will be in the pond after 1 week?     (round to the nearest gallon) The landscaper will put another dose in the pond when the herbicide level drops below 50 gallons. In about how many weeks will he need to add more herbici

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