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I think its C. 5 that equals K.
Answer:
C: Starting at 1103 you gain 91 feet each additional hour of climing.
Step-by-step explanation:
The given expression for the area, 81x² - 4y², is a difference of two squares. The first term is the square of 9x and the second term is the square of 2y. The factors of this difference and the therefore the dimensions of the rectangle are, 9x - 2y and 9x + 2y.
