Which of the diagrams correctly displays a→+b→=c→, using the parallelogram method?

Which representation has a constant of variation of -2.5

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a