Two vertical angles ABC and CBD sum to 100 degrees. What is the measure of Angle ABC in degrees? Enter your answer in the box provided.
Exhibits

The native americans, spanish, french and americans all name places in our state. the word “arkansas” came from the quapaw indians, by way of early french explorers. at the time of the early french exploration, a tribe of indians, the quapaws, lived west of the mississippi and north of the arkansas river.