Un conducteur roule pendant 1 h 48 min à la vitesse moyenne de 80km/h, puis pendant 42 minutes à la vitesse moyenne de 90 km/h.
1)Combien de temps a-t-il roulé ?
2)Quelle distance a-t-il parcourue au total ?
3)Calculer sa vitesse moyenne sur l'ensemble du trajet.

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,

i need more details sorry

step-by-step explanation: