I need help with 15,19,17

Negative exponents

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false

Will mark brainliest! ( explain the answer too, it can be one sentence)

Each weekday davina rides her bike from her house to school. after school, she rides to the library. then davina takes the same route to get home. these locations are shown on the grid below, where 1 unit on the grid represents 1 kilometer. how many kilometers does she ride each day? 10 16 20 32