contestada

a cell phone company charges $10 per month for up to 500 text messages and $0.15 for each additional text messages. Stanley was charged $14.50 last month for text messages. Write and solve an equation to find the number of text messages he sent and received last month.

Respuesta :

Because he was charged more than $10, we can write the equation:

0.15*t+10=14.50

Where t is the amount of text messages over 500.

Alternatively, you could do:

0.15*(t-500)+10=14.50

Where t is the amount of text messages.  0.15 modifies t or t-500 because it's the cost for texts over 500, and 10 is added for the first 500 texts.  14.50 is on the other side because it's the total cost.

Otras preguntas