Mathematics
Grade10
Easy

Question

A car rental charge is 100 dollars per day plus 0.30 dollars per miles traveled. Determine the function of the line that represents the daily cost by the number of miles traveled.

  1. C left parenthesis x right parenthesis equals 0.30 x minus 100
  2. C left parenthesis x right parenthesis equals 0.30 x plus 100
  3. C left parenthesis x right parenthesis equals 100 minus 0.30 x
  4. C left parenthesis x right parenthesis equals 30 x plus 100

hintHint:

We are given the rent charge of a car. It is 100 dollars per day plus 0.3 dollars per miles. We have to find the function of line that represents daily cost by the number of miles travelled. We have to see which of the value is constant and a variable.

The correct answer is: C left parenthesis x right parenthesis equals 0.30 x plus 100


    The function is of daily cost. It means 100 dollars is constant. As, it is the charge per day.
    Let’s denote the number of miles by x.
    So, charge per mile is given by 0.3x dollars. It is rate per mile.
    We have to find daily cost as a function of number of miles travelled. We can represent it as C(x)
    The operation between the variable and the constant is plus.
    We can write the given function as follows:
    C(x) = 0.3x + 100

    For such questions, we should know about the concept of function.

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