Maria invested $4,000 at 3.5% simple interest. she left the principal invested for 57 months. robert invested $3,500 at 8.5% simple interest. he left the principal invested for 42 months. how much more total money did maria have than robert at the end of their investments?

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?