What kind of number is -9/10

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

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8