Convert each rate, Round to the nearest tenth if necessary (Please can someone help me with theses last questions)

19, 62 mi/h =ft/sec
20.40 m/s = ft/min
21. 100 ft/s =mi/h
22.2 qt/s = gal/min
23.8 qt/min =fl. oz./sec
24.40 m/s =km/h

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.