Final answer:
To represent the growth of a tree at a rate of one foot per year, use the equation 'Height of the tree = 1 foot/year * number of years'.
Step-by-step explanation:
To represent the growth of a tree at a rate of one foot per year as an equation, we can use the following equation:
Height of the tree = 1 foot/year * number of years
For example, if we want to find the height of the tree after 5 years, we can substitute 5 into the equation:
Height of the tree = 1 foot/year * 5 years = 5 feet