Unless otherwise posted, the maximum speed limit in any urban or residential district is mph.

25 mph

Explanation:

Every type of location has it's own speed limits. In Urban and residential/school districts the speed limit is 25 mph unless otherwise posted. This is because there are a lot of pedestrians walking the streets and if the speed limit were any higher then a distracted driver can easily take countless lives. Also a majority of the people in these areas are children who can easily wander into the street unsupervised and into oncoming traffic. This speed allows the drivers to have more time to act in these situations.

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the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

answer; /// i believe that the correct answer is (a) making presentations;