What is the simplified form of 64x^16

Which equation requires the division property of equality to be solved?

Acircular city park has a sidewalk directly through the middle that is 111 - feet long. if each bag of fertilizer covers 50 square feet, then determine how many bags of fertilizers the parks and recreation department needs to use to cover the circular park. ignore all the sidewalks around and through the park.

What is the number 321,000,000 in scientific notation? also what is the number? ?