Asunflower grows an average of 5mm per week. write an equation for the sequence that represents the weekly height of this sunflower if the measurements begin when the sunflower is 1 meter tall
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If it grows at 5mm per week the slope is 0.005m per week, and since it starts at 1 meter in height that is the y-intercept.  So the height in meters as a function of weeks is:

h(w)=0.005w+1

or if you wanted the height in mm then:

h(w)=5w+1000

In this problem it decreased 20%