If the circumference of a round barn is 56 meters, what is the diameter of the barn to the nearest whole meter ? use 3.14 pi

Achel bought 12 rolls of packing tape and paid a total of $33.60. kevin also bought rolls of packing tape. the table shows the total amount he is paid for different numbers of packing tape. number of rolls of packing tape total amount paid 2 $6.40 5 $16.00 8 $25.60 how do the unit rates compare? select from the drop-down menus to correctly complete the statement. rachel's unit rate is than kevin's because is greater than .

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Could somebody me with this radical simplification?