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4. Six foot tall pine trees were planted during the
school's observation of Earth Awareness Week in
1990. The trees have grown at an average rate of
3/4 foot per year. How tall would they be in 2010?

The height of the trees in the year 2010, given their average rate of growth will be 21 foot How to find the height of the trees?The trees are said to grow at a rate of 3/4 foot per year. In decimals this is:= 3 / 4= 0.75The number of years between 1990 and 2010 is:= 2010 - 1990= 20 years The height of the trees in 2010 would be:= Current height x ( Rate of growth x number of years)= 6 x (0.75 x 20)= 21 foot Find out more on the height of trees at https://brainly.com/question/9655877#SPJ1