1. Un coureur de demi-fond parcourt 850 m en 3 minutes 12 secondes. Calculer sa vitesse moyenne en m/s. Arrondir à l’unité.
2. Juliette est en voiture et roule à une vitesse moyenne de 120 km/h.
a. Quelle distance parcourt-elle en 4 h 12 min ?
b. Elle part de Givors à 16h12 et parcourt 319 km. A quelle heure arrive-t-elle ?
Donner le résultat en heure et en minutes

I don’t know the answer I just need some points to ask more questions

Step-by-step explanation:

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is