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# Pollution / Linear

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Hi everyone, could someone help me to resolve this ?

The pollution level in the center of a city at 6am is 30 parts per million and it grows linearly by 25 parts per million every hour. If P(t) is the pollution level in part per million and t is the time elapsed after 6 am in hours, determine :

1. The function that relate P(t) with t ?

2. The pollution level at 4pm ?

Thank you so much !

Thalys

Thalys  Nov 2, 2015

#1
+81014
+10

(1)  P(t)   = 25t + 30

(2) At 4PM....this is 10 hours after 6AM.....so

P(10)  = 25(10) + 30  =    280 PPM

CPhill  Nov 2, 2015
Sort:

#1
+81014
+10

(1)  P(t)   = 25t + 30

(2) At 4PM....this is 10 hours after 6AM.....so

P(10)  = 25(10) + 30  =    280 PPM

CPhill  Nov 2, 2015
#2
+191
0

Thank you ! :D

Thalys  Nov 2, 2015

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