Last year, Evelin's invested 10,000 dollars, part at 6% annual interest, and the rest at 8% annual interest. If she recieves $760 at the end of the year, how much did he invest at each rate?
Alex from Livingston, NJ's Resources
The difference between the length and width of a rectangle is 7 centimeters. Find the dimensions of the rectangle if it's perimeter is 50 centimeters