To determine the height of the pine trees in 2022, we need to find out how many years have passed since 1990.
From 1990 to 2022 is 32 years.
The trees grow at an average rate of \( \frac{3}{4} \) foot per year. So, over 32 years, we can calculate the total growth:
\[ \text{Total growth} = \text{Growth per year} \times \text{Number of years} = \frac{3}{4} \text{ foot/year} \times 32 \text{ years} \]
Calculating this:
\[ \frac{3}{4} \times 32 = 24 \text{ feet} \]
Now, we add this total growth to the original height of the trees:
\[ \text{Original height} = 2 \text{ feet} \] \[ \text{Height in 2022} = \text{Original height} + \text{Total growth} = 2 \text{ feet} + 24 \text{ feet} = 26 \text{ feet} \]
Therefore, the height of the pine trees in 2022 is 26 feet.