I NEED HELP WITH THIS ASAP

How do i do this? i don’t understand

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

Were only 64 seats. the remaining 6 students had to travel in a separate van. the equation 2b + 6 = 70 represents the given scenario. what does b represent? the number of buses the number of vans the number of students who rode on each bus the total number of students going to the football game