What can you say about ∠ADB and ∠BDC based on the sum of their angles? How are the angles related?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

Write the percent as a fraction or mixed number in simplest form. 0.8%