Each month, a phone company charges $20 for 500 minutes of talk time plus $0.45 for each additional minute. unlimited texting cost $30 more. write an expression to show the cost of a talk-and-texting plan for one month, given x minutes over 500

Using the cost information given, the cost function of the phone company for a month plab would be : C(x) = 50 + 0.45x

The cost function of the company can be expressed thus :

Hence,

C(x) = 20 + 0.45x + 30

C(x) = 50 + 0.45x

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C = 50 + (0.45x)

Step-by-step explanation:

If 500 minutes of talk = 20

and texting = 30

and each additional minute of talk = 0.45

then the bill would be (for C = total cost)

C = 20+30+(0.45 • x)

OR

C = 50 + 0.45x

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.