Respuesta :

c = calls
m=minutes

.21c+.06m = 1.95
.21(5)+.06m = 1.95
1.05+.06m = 1.95
-1.05 -1.05
.06m = .90
÷ .06 ÷.06
m= 16


ANSWER: In total, Kathy talked for 16 minutes
OR m = 16