Investigators tested the hypothesis that chemicals in fertilizers increases the risk of cancer. They formed a cohort of employees of a fertilizer manufacturing factory. The employees who worked with chemicals used in the manufacturing process were the exposed group, while clerical workers constituted the unexposed group. They then observed these workers for 10 years to assess the incidence of cancers. This study design is an example of

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

step-by-step explanation:

1.) 21

2.) 0.453

3.) 1.5

4.) 48

5.) $ 22

step-by-step explanation: