Question

how do i do -9/7.2

Answer 1

you have a fraction and you can do this
\[ \frac{-9}{7.2} \cdot \frac{10}{10}= \frac{-90}{72} \]
notice you can divide top and bottom by 2 to get
\[ \frac{-90}{72} = \frac{-45}{36} \]
we might notice that we can divide top and bottom by 9:
\[ \frac{-5}{4} = - \frac{5}{4}\]

we can write that as a mixed number
\[ -1 \frac{1}{4} \]
or as a decimal
-1.25