bonjour svp j'ai un exo de maths​

Bonjour,

Xintia = k minutes
Zoe = k minutes - 10 minutes
Yasmine = 3 (k minutes - 10 minutes)

Donc,

f(k) = k - 10 (Zoe)
f (k) = 3 (k- 10) (Yasmina)