The distance, in feet, traveled by bike is given by the function d(t) = 7.8t + 28, where t is measured in seconds. Find and interpret d(7).

d(7) = 82.6; after 7 seconds, the bike traveled 82.6 feet
d(7) = 35.8; after 7 seconds, the bike traveled 35.8 feet
d(7) = 82.6; after 82.6 seconds, the bike had traveled 7 feet
d(7) = 35.8; after 35.8 seconds, the bike had traveled 7 feet