Find the number of bacteria after 10 minutes?​

I’m stuck on this i don’t understand.

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2