Mathematics
Grade10
Easy

Question

The pollution level in the centre of a city at 6 am is 30 ppm (parts per million) and it grows in a linear fashion by 25 ppm (parts per million) every hour. If  y is pollution and t is the time elapsed after 6 am, then determine the function that relates y  with t .

  1. y equals 25 minus 30 t
  2. y equals 30 minus 25 t
  3. y equals 30 plus 25 t
  4. y equals 25 plus 30 t

hintHint:

To form of function we will use the pollution at 6 am & the constant increase in the pollution .

The correct answer is: y equals 30 plus 25 t


    STEP BY STEP SOLUTION
    The pollution level at 6am = 30ppm
    It grows per hour = 25ppm
    y= pollution & t = time
    The function that relates y with t.
    y = pollution level at 6am + It grows pr hour cross times Time
    y= 30 + 25t

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