CH 3: Calculating the period of an investment

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Questions and Answers

What is the general form of an exponential function?

  • f(x) = x^b
  • f(x) = b + x
  • f(x) = b * x
  • f(x) = b^x (correct)

What condition must be satisfied for the base b in an exponential function?

  • b > 0 and b ≠ 1 (correct)
  • b > 0 and b = 1
  • b = 0 and b ≠ 1
  • b < 0 and b ≠ 1

What happens when the base b in an exponential function is greater than 1?

  • The function exhibits exponential decay.
  • The function exhibits exponential growth. (correct)
  • The function oscillates.
  • The function remains constant.

What is the y-intercept of the graph of an exponential function f(x) = b^x?

<p>(0, 1) (D)</p> Signup and view all the answers

What is the domain of an exponential function?

<p>All real numbers (B)</p> Signup and view all the answers

What is the range of an exponential function?

<p>All positive real numbers (D)</p> Signup and view all the answers

What is the horizontal asymptote of an exponential function?

<p>y = 0 (D)</p> Signup and view all the answers

What is the general form of a logarithmic function?

<p>y = log_b(x) (D)</p> Signup and view all the answers

What condition must be satisfied for the base b in a logarithmic function?

<p>b &gt; 0 and b ≠ 1 (A)</p> Signup and view all the answers

If f(x) = log_b(x), what is the value of f(b)?

<p>0 (B)</p> Signup and view all the answers

What is the inverse operation of the logarithm function?

<p>Exponential function (A)</p> Signup and view all the answers

What is the domain of the logarithm function?

<p>Positive real numbers (C)</p> Signup and view all the answers

What is the range of the logarithm function?

<p>All real numbers (D)</p> Signup and view all the answers

What is the intercept of the logarithm function?

<p>(1, 0) (C)</p> Signup and view all the answers

What is the asymptotic behavior of the logarithm function?

<p>Vertical asymptote at x = 0 (C)</p> Signup and view all the answers

What is the rule for multiplying two numbers using logarithms?

<p>Product Rule: $\log_b(xy) = \log_b(x) + \log_b(y)$ (D)</p> Signup and view all the answers

What is the rule for dividing one number by another using logarithms?

<p>Quotient Rule: $\log_b\left(\frac{x}{y}\right) = \log_b(x) - \log_b(y)$ (A)</p> Signup and view all the answers

What is the rule for exponentiation using logarithms?

<p>Power Rule: $\log_b(x^p) = p \cdot \log_b(x)$ (A)</p> Signup and view all the answers

What is the formula used to convert the base of a logarithm?

<p>Change of Base Formula: $\log_b(x) = \frac{\log_k(x)}{\log_k(b)}$ (A)</p> Signup and view all the answers

Which of the following statements about solving exponential equations is true?

<p>It requires isolating the exponential term and applying logarithmic operations to both sides. (D)</p> Signup and view all the answers

What is the main difference between exponential growth and exponential decay?

<p>Exponential growth occurs when the base b is greater than 1, while exponential decay occurs when the base b is between 0 and 1. (B)</p> Signup and view all the answers

What is the range of the logarithmic function $y = \log_b(x)$?

<p>The range is all positive real numbers (0, $\infty$). (D)</p> Signup and view all the answers

What is the value of $\log_b(b)$?

<p>1 (C)</p> Signup and view all the answers

Which of the following statements about the domain of an exponential function $f(x) = b^x$ is correct?

<p>The domain is all real numbers, i.e., $(-\infty, \infty)$. (D)</p> Signup and view all the answers

What is the rule for converting the base of a logarithm from b to a?

<p>$\log_a(x) = \frac{\log_b(x)}{\log_b(a)}$ (A)</p> Signup and view all the answers

What is the horizontal asymptote of the exponential function $f(x) = b^x$?

<p>The horizontal asymptote is the line $y = 0$. (A)</p> Signup and view all the answers

Which of the following statements about the y-intercept of the graph of the exponential function $f(x) = b^x$ is correct?

<p>The y-intercept is always 1, regardless of the base b. (D)</p> Signup and view all the answers

What is the inverse operation of the logarithm function?

<p>The inverse operation of the logarithm function is the exponential function. (C)</p> Signup and view all the answers

What is the rule for exponentiation using logarithms?

<p>$b^{\log_b(x)} = x$ (D)</p> Signup and view all the answers

What happens when the base b in an exponential function $f(x) = b^x$ is greater than 1?

<p>The function exhibits exponential growth. (D)</p> Signup and view all the answers

If $\log_2(x) = 5$, what is the value of $x$?

<p>$2^5$ (D)</p> Signup and view all the answers

Given $\log_3(x) + \log_3(y) = 2$, what is the value of $\log_3(xy)$?

<p>2 (D)</p> Signup and view all the answers

If $\log_5(x) = 2$ and $\log_5(y) = -1$, what is the value of $\log_5\left(\frac{x}{y}\right)$?

<p>3 (D)</p> Signup and view all the answers

If $\log_2(x) = 3$, what is the value of $\log_4(x)$?

<p>$\frac{3}{\log_2(4)}$ (B)</p> Signup and view all the answers

If $\log_2(x) = 4$, what is the value of $\log_2(x^3)$?

<p>12 (D)</p> Signup and view all the answers

If $f(x) = \log_2(x)$, what is the value of $f(16)$?

<p>4 (A)</p> Signup and view all the answers

If $\log_3(x) = 2$ and $\log_3(y) = 4$, what is the value of $\log_3\left(\frac{x^2}{y}\right)$?

<p>-2 (B)</p> Signup and view all the answers

If $\log_2(x) = 3$ and $\log_4(y) = 2$, what is the value of $\log_8(xy)$?

<p>$\frac{11}{3}$ (B)</p> Signup and view all the answers

If $\log_5(x) = 2$ and $\log_5(y) = -1$, what is the value of $\log_5\left(\frac{x^2}{y^3}\right)$?

<p>5 (C)</p> Signup and view all the answers

If $\log_3(x) = 2$ and $\log_3(y) = -1$, what is the value of $\log_9\left(\frac{x^2}{y}\right)$?

<p>$\frac{5}{2}$ (D)</p> Signup and view all the answers

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