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Q2E

Expert-verifiedFound in: Page 632

Book edition
2nd

Author(s)
James Stewart

Pages
830 pages

ISBN
9781133112280

**Explain why each function is continuous or discontinuous.**

**The outdoor temperature as a function of longitude, latitude and time****Elevation (height above sea level) as a function of longitude, latitude and time.****The cost of a taxi ride as a function of distance traveled and time.**

According to the definition of continuous function, the outdoor temperature as a function of longitude, latitude and time is continuous.

**Continuous function:-**

Continuous function is a function such that a continuous variation (that is a **change without a jump**) of the argument induces a continuous variation of the value of the function. This means that there are no abrupt changes in value.

**Discontinuous function:-**

Discontinuous function is a function such that a continuous variation (that is a **change with a jump**) of the argument induces a discontinuous variation of the value of the function. This means that there are abrupt changes in value.

The outdoor temperature as a function of longitude, latitude and time is continuous.

Small changes in longitude, latitude or time can produce only small changes in temperature, as the temperature does not jump abruptly from one value to another.

Therefore, the outdoor temperature as a function of longitude, latitude and time is continuous.

**Answer (b):**

According to the definition of discontinuous function, Elevation (height above sea level) as a function of longitude, latitude and time is discontinuous.

**Continuous function:-**

Continuous function is a function such that a continuous variation (that is a **change without a jump**) of the argument induces a continuous variation of the value of the function. This means that there are no abrupt changes in value.

**Discontinuous function:-**

Discontinuous function is a function such that a continuous variation (that is a **change with a jump**) of the argument induces a discontinuous variation of the value of the function. This means that there are abrupt changes in value.

Elevation is not necessarily continuous. If we think of a cliff with a sudden drop off, a very small change in longitude or latitude can produce a comparatively large change in elevation, without all the intermediate values being attained. Elevation can jump from one value to another.

Therefore, Elevation (height above sea level) as a function of longitude, latitude and time is discontinuous.

**Answer (c):**

According to the definition of discontinuous function, the cost of a taxi ride as a function of distance traveled and time is discontinuous.

**Continuous function:-**

Continuous function is a function such that a continuous variation (that is a **change without a jump**) of the argument induces a continuous variation of the value of the function. This means that there are no abrupt changes in value.

**Discontinuous function:-**

Discontinuous function is a function such that a continuous variation (that is a **change with a jump**) of the argument induces a discontinuous variation of the value of the function. This means that there are abrupt changes in value.

The cost of a taxi ride is usually discontinuous. The cost normally increases in jumps, so small changes in distance traveled or time can produce a jump in cost. A graph of the function would show breaks in the surface.

Therefore, the cost of a taxi ride as a function of distance traveled and time is discontinuous.

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