Samantha glued stickers on a sheet with an area of 1260 square sentimeters in 1/6 of an hour what is the speed, in square centimeters per hour, at which samantha glued stickers

All you have to do here is to find the unit rate for 
"an area of 1260 square sentimeters in 1/6 of an hour:"

1260 sq. cm.
=  (1260)(6) sq cm per hour   =  7560 sq cm per hour (answer)
    (1/6) hr

Documentation and time management