There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (0.85 - 0.0075x)(1.3 + 0.015x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 0.01275x - 0.00975x - 0.0001125x^{2} + 1.105\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 0.01275x - 0.00975x - 0.0001125x^{2} + 1.105\right)}{dx}\\=&0.01275 - 0.00975 - 0.0001125*2x + 0\\=& - 0.000225x + 0.003\\ \end{split}\end{equation} \]

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