contestada

(2) An international call to a certain country costs Rs. 7
for the first minute, and Rs. 4 per minute thereafter.
Write down an expression in rupees for the cost of
a 10 minutes long international call. Simplify your
expression​

Respuesta :

MrRoyal

Answer:

[tex]y = 43[/tex]

Step-by-step explanation:

Given

[tex]First\ Minute = 7[/tex]

[tex]Additional\ Minutes = 4[/tex] per minute

Required

Determine the cost of a 10 minutes call

First, we need to determine the expression for the call charges.

Let:

  • x = minutes
  • y = charges

The relationship between x and y is:

[tex]y = First\ Minute + Additional\ Minutes(Number\ of\ minutes\ - 1)[/tex]

i.e.

[tex]y = 7 + 4(x - 1)[/tex]

1 is subtracted from the total minutes because the first minute has a fixed rate.

For a 10 minutes call

[tex]x = 10[/tex]

[tex]y = 7 + 4(x - 1)[/tex]

[tex]y = 7 + 4(10 - 1)[/tex]

[tex]y = 7 + 4*9[/tex]

[tex]y = 7 + 36[/tex]

[tex]y = 43[/tex]

Hence, the charges for a 10 minutes call is: Rs.43

Otras preguntas