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Ch. 2 - Limits
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Not the one you use?Change textbook
All textbooksBriggs 3rd EditionCh. 2 - LimitsProblem 2.R.8e
Chapter 2, Problem 2.R.8e

Suppose the rental cost for a snowboard is \$25 for the first day (or any part of the first day) plus \$15 for each additional day (or any part of a day).
e. For what values of t is f continuous? Explain.

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1
Step 1: Understand the function f(t) that represents the rental cost. The function is piecewise, with a fixed cost for the first day and a different rate for additional days.
Step 2: Define the function f(t) as f(t) = 25 for 0 < t ≤ 1 and f(t) = 25 + 15(t - 1) for t > 1, where t is the number of days.
Step 3: Identify the points where the function might be discontinuous. Discontinuities in piecewise functions often occur at the boundaries between pieces, in this case, at t = 1.
Step 4: Check the continuity at t = 1 by evaluating the left-hand limit, right-hand limit, and the value of the function at t = 1. Ensure that these three values are equal for continuity.
Step 5: Conclude that the function f(t) is continuous for all t > 0 except possibly at t = 1, depending on the results of the limits and function value at that point.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Continuity of Functions

A function is continuous at a point if the limit of the function as it approaches that point equals the function's value at that point. This means there are no breaks, jumps, or holes in the graph of the function at that point. For a function to be continuous over an interval, it must be continuous at every point within that interval.
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Intro to Continuity

Piecewise Functions

A piecewise function is defined by different expressions based on the input value. In the context of the snowboard rental cost, the function can be expressed in segments: one for the first day and another for subsequent days. Understanding how to analyze these segments is crucial for determining continuity, especially at the boundaries where the function changes.
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Piecewise Functions

Limits

Limits are fundamental in calculus for understanding the behavior of functions as they approach a certain point. To determine continuity, one must evaluate the left-hand limit and right-hand limit at the point of interest. If both limits exist and are equal to the function's value at that point, the function is continuous there.
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Related Practice
Textbook Question

For any real number x, the floor function (or greatest integer function) ⌊x⌋ is the greatest integer less than or equal to x (see figure).


a. Compute lim x→−1^− ⌊x⌋, lim x→−1^+ ⌊x⌋,lim x→2^− ⌊x⌋, and lim x→2^+ ⌊x⌋.

Textbook Question

b. Estimate a solution to the equation in the given interval using a root finder.


x=cos x; (0,π/2)

Textbook Question

Evaluate limx→∞f(x){\(\displaystyle\[\lim\)_{x\(\to\]\infty\)}{f(x)}} andlimx→−∞f(x){\(\displaystyle\]\lim\)_{x\(\to\)-\(\infty\)}{f(x)}}.


f(x)=1−e−2xf\(\left\)(x\(\right\))=1-e^{-2x}

Textbook Question

Determine the following limits.


a. limx→1+x−3x2−5x+4{\(\displaystyle\]\lim\)_{x\(\to\)1^{+}}\(\frac{x-3}{\sqrt{x^2-5x+4}\)}}

Textbook Question

Determine the following limits.

lim x→∞ (2x − 3) / (4x + 10)

Textbook Question

Let g(x)={5x−2if x<1aif x=1ax2+bxif x>1g\(\left\)(x\(\right\))=\(\begin{cases}\)5x-2 & \(\text{if }\)x<1\\ a & \(\text{if }\)x=1\\ ax^2+bx & \(\text{if }\)x>1\(\end{cases}\).


Determine values of the constants aa and bb , if possible, for which gg is continuous at x=1x=1.