Two investments totaling $53,500 produce an annual income of $3485. One investment yields 7% per year, while the other yields 6% per year. How much is invested at each rate?

the answer is "c" im pretty sure.

if he does not use open the compass the a width greater than half of po, he will not be able to find the midpoint of the line, without the midpoint of the line, he will not be able to bisect the line.   to find the midpoint of a line the circles drawn with a compass must either intersect or be touching.