Question

(3/16+9/16)(1/4-5/9)

Answer 1

-432/25 or -17.28.

Answer 2

\[({3\over 16}+{9\over 16})({1\over 4}-{5 \over 9})\]
\[({3+9\over 16})({1\cdot 9\over 4 \cdot 9}-{5\cdot 4 \over 9\cdot 4 })\]
\[({12\over 16})({9\over 36}-{20 \over 36})\]
\[({3\cdot 4\over 4\cdot 4})({9-20\over 36})\]
\[({3\over 4})({-11\over 36})\]
\[{3\cdot -11}\over{4\cdot 36}\]
\[{3\cdot -11}\over{4\cdot 12 \cdot 3}\]
\[{-11}\over{4\cdot 12}\]
\[-11\over 48 \]

Answer 3

-11/48