Noel is a computer repairman. To fix a computer, he charges a customer $40 per hour, plus a fixed fee of $15 for the service call, as represented by the function f(x) = 40x + 15. In the equation, what is represented by the variable “x”? A. the amount Noel charged per hour

B. the number of hours Noel worked

C. the fixed fee for the service call

D. the total cost of the repair job

B

Step-by-step explanation:

40x(amount noel worked) because he is charging 40$ at a rate of 40 p/h so it is B.

$3781.19

Step-by-step explanation:

Let us assume that the student has to earn $(1900 + x) by September 1 so that he can pay the $1900 tuition fee by September 1 and the remaining $x will grow at 3% simple interest to make him able to pay another tuition fee of $1900 by January 1.

So, we can write

{Because September 1 to January 1 is 4 months and the monthly simple interest rate is %}

⇒ 1.01x = 1900

⇒ x = $1881.19 (Rounded to the nearest cents)

Therefore, the student has to earn $(1900 + 1881.19) = $3781.19 (Answer)