Math Problem Solver

\[ -15 + 1.50 = - \frac{27}{2} = -13.5 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{-15}{1}\), \(\frac{1}{1}\), and \(\frac{5}{10}\) is \(10\). \[ \begin{aligned} -15 + 1.50 &= \frac{-15 \cdot 10}{1 \cdot 10} + \frac{1 \cdot 10}{1 \cdot 10} + \frac{5 \cdot 1}{10 \cdot 1} \\ &= \frac{-150 + 10 + 5}{10} \\ &= \frac{-135}{10} \\&= - \frac{27}{2} \end{aligned} \]