A tree 7 ft tall grows an average of 6 in. each year. Which equation models the tree’s height h after x years

6 in is (1/2)ft so it grows (1/2) ft each year. Since it starts at 7 ft, the height, in feet, after x years is given by

h = 7 + x/2  

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The equation you are looking for is y=.7x plus seven. While x is the amount of years.