Represent the following 5 problems using a function notation: 1.When digging into the earth, the temperature rises according to equation y = 20 + 0.01x, where y is the increase in temperature in degrees and x is the depth in meters. At what depth would there be a temperature of 80 ºC?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Represent the following 5 problems using a function notation:

1.When digging into the earth, the temperature rises according to equation y = 20 + 0.01x, where y is the increase in temperature in degrees and x is the depth in meters. At what depth would there be a temperature of 80 ºC?


2. The pollution level in the center of a city at 6 am is 30 parts per million and it grows in linear function by 25 parts per million every hour. If y is pollution and x is time elapsed after 6 am, determine the time the pollution level is at 80 parts per millions?


3. Jonah is planning to have her 18th birthday party at a resort. It will cost her a base fee of PhP 10 000.00 plus PhP180.00 per guest. If her parents gave her PhP 19 000.00 as her
budget for the party, what is the maximum number of guests she can accommodate?

4. EJ, a motorcycle rider, drives at a speed of 75 kilometers per hour. How long will it take him to reach his destination which is 225 kilometers away from his starting point?


5. Jon Bernie pawn an 18-karat gold necklace. Each gram of gold is worth PhP 1 500.00. If he had accumulated a total amount of PhP 11 400.00 for pawning, how many grams is
the necklace?

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