Chapter 3: Problem 90
Is the function \(f\) defined by \(f(x)=2^{x}\) for every real number \(x\) an even function, an odd function, or neither?
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Chapter 3: Problem 90
Is the function \(f\) defined by \(f(x)=2^{x}\) for every real number \(x\) an even function, an odd function, or neither?
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Suppose a television is playing softly at a sound level of 50 decibels. What decibel level would make the television sound eight times as loud?
Show that \((99+70 \sqrt{2})^{1 / 3}=3+2 \sqrt{2}\).
Explain why $$ 10^{100}\left(\sqrt{10^{200}+1}-10^{100}\right) $$ is approximately equal to \(\frac{1}{2}\).
Explain why every function \(f\) with exponential growth can be represented by a formula of the form \(f(x)=c \cdot 2^{k x}\) for appropriate choices of c and \(k\).
Show that if \(x\) and \(y\) are positive numbers, then $$ \sqrt{x+y}<\sqrt{x}+\sqrt{y}. $$ [In particular, if \(x\) and \(y\) are positive numbers, then \(\sqrt{x+y} \neq \sqrt{x}+\sqrt{y}\).]
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