Sandra is riding a bicycle at 10.0 meters/second. she slows down to 2.0 meters/second in 10 seconds. her acceleration is ( ) meters/second2.

Change of speed = -8 m/s 
time = 10 s 
acceleration = -8/10 = -0.8 m/s^2

Hope this helps :)

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.