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====== Math 445 HW1 ====== **Problem 0:** If you have your own computer and want to run Matlab on it, download and install Matlab from {{http://at.unh.edu/acs/services/software/ | UNH academic software}}. **Problem 1:** Given two variables $x$ and $y$, write a Matlab expression that evaluates to true (1) if $x$ and $y$ have opposite signs and false (0) otherwise. **Problem 2:** The combined resistance $R_T$ of three resistors $R_1, R_2, R_3$ in parallel is given by \begin{eqnarray*} R_T = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}} \end{eqnarray*} Create variables for the three resistors, with values 5, 3, and 4. Then write a matlab expression that will com