The value of b is 61°.
you solve by doing this:
add up the two given angles, 58° and 61° to get 119°. then you subtract from 180° to get 61.
3/12x5 is the answer of your question.
The percent of decrease on an item that went from $25 to $20 is 5 percent.
B. The diagonals bisect each other.