PLEASE HELP FAST! The crop circle above has an inner circular design that measures 20 feet across and an outer border that measures 2 feet across. Is someone were to walk around the entire outer edge of this crop circle, how many feet would they walk?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Which statement describes surface features called maria on the moon

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189