In 2011, there were 984 rotary rigs drilling for crude oil in the united states. this was 687 more rigs than were active in 2007. find the number of active rotary oil rigs in 2007.

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?