Math

This question has two parts.
Danielle's phone plan charges her $30 per month for the first 200 minutes and then $0.10 per minute for each subsequent minute.

1. Which of the following functions takes an input of any whole number value of x is greater than or equal to 200 and outputs the value for f(x) as the amount of dollars Danielle would pay for x minutes of phone usage?
A. f(x) = 0.1x + 10
B. f(x) = 0.1x + 20
C. f(x) = 0.1x + 30
D. f(x) = 0.1x + 200
E. f(x) = 0.1x + 230

2. If Danielle paid exactly $100 last month, how many minutes did she use?
F. 700
G. 800
H. 900
J. 1,000
K. 1,200

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  1. 1. ) = 30 + 0.1(x-200)
    F(x) = 30 + 0.1x - 20
    The above Eq is valid for all real
    values of X that are equal to or greater
    than 200: X => 200.

    When x = 200 minutes, the cost would be
    $30.

    None of the given choices meets this
    requirement.

    2. Cost = 30 + 0.1x - 20 = $100
    0.1x = 100-10 = 90
    X = 900 Minutes.

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  2. whats the answer?

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