Pleaseee help me i beggg ill droppp a whole bunch of points if u can feel in the boxes will drop 40 points plz help me

How do you find the circumfrance of a circle?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

Find the common ratio of the sequence. -4, 8, -16, 32, a: -12b: -2c: 12d: -1/-2