The parking garage will add new levels of parking space. each new level will have twice the number of parking spaces as the old levels. how many parking spaces in all will be on these 2 new levels?

If ac = 12 and ab=7 is it possible that bc =10

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

How do i do this activity, is appreciated