There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (200 + 5t)(0.65 - 0.01t + 0.0004{t}^{2}) - 0.45t\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = - 2t + 0.002t^{3} + 3.25t - 0.05t^{2} + 0.08t^{2} - 0.45t + 130\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( - 2t + 0.002t^{3} + 3.25t - 0.05t^{2} + 0.08t^{2} - 0.45t + 130\right)}{dx}\\=& - 0 + 0 + 0 + 0 + 0 + 0 + 0\\=&0\\ \end{split}\end{equation} \]

Your problem has not been solved here? Please take a look at the  hot problems ！