Respuesta :

Answer:

Step-by-step explanation:

1)  phone

38.95 = 0.03 * mins + 29.95

9.00 = 0.03 * mins

9.00 /0.03 = mins

300 = mins

so he used 300 minutes  :)

2) books

8.70 =14 * bookPrice + 2.40

6.30 = 14 * bookPrice

6.30 / 14 = bookPrice

0.45 = bookPrice

each book cost 45 cents  :)

Otras preguntas