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Honeyswish7730
07.01.2020 •
Mathematics
La compañía de teléfonos celulares a cobra $ 20 por mes más $ 0.05 por mensaje de texto. la compañía de teléfonos celulares b cobra $ 10 por mes más $ 0.07 por mensaje de texto. ¿hay algún número de mensajes de texto que resulten en el mismo cargo exacto de ambas compañías?
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Ответ:
Y es. 500
Explicación:
Si x es el número de mensajes de texto por mes, la compañía A cobra 20 + 0.05⋅x y la compañía B cobra 10 + 0.07⋅x
Si la carga es la misma, entonces
20 + 0.05⋅x = 10 + 0.07⋅x
20−10 = 0.07⋅x - 0.05⋅x
10 = 0.02⋅x
x = 100.02 = 102100 = 10⋅1002 = 500
Ответ:
Step-by-step explanation:
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