ONE QUESTION, ONE STEP
ZX-1AAD9D904D2026年3月国际A卷 · 第 14 题
2026年3月国际A卷 · 原库模块 3 · Q14 原库参考解析
A model estimates that in a particular forest, the number of trees with any given diameter measured at shoulder height is 21% less for each 1-inch increase in tree diameter measured at shoulder height. The model can be written in the form \( f(x)=ab^x \), where a and b are constants and x is the tree's diameter, in inches, measured at shoulder height, and \( x\ge5 \). The model estimates that 3,100 trees in this forest have a diameter of 13 inches measured at shoulder height. Which function best represents this model?
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