How does a rock formation with a a band of quartz wrapped around it in one direction and another band of quartz wrapped around the rock at a complete 90 degree difference form? could this be from pole reversal?

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)