Problems of the Day Simplify each expression. 1. (9s 3 t 2 )(−3st) 2. 5xy 2 (x + y) 3. 7mn(m 2 + 10mn – 2) 4. d( − 3d + 5) + 15d 5. 4w(5w – 4) + 3(w 2.
