Help pls it’s due right now

Which expression is equivalent to 64 - 9x^2?

The ordered pair (2,-5.2) is located in quadrant iv

Students are getting signatures for a petition to increase sports activities at the community center. the number of signatures they get each day is 3 times as many as the day before. the expression 3^6 represents the number of signatures they got on the sixth day. how many signatures did they get on the first day?