Chapter 7: Problem 19
In Exercises \(1-21,\) solve the equation for the variable. $$ \frac{1}{\sqrt[3]{x}}=-3 $$
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Chapter 7: Problem 19
In Exercises \(1-21,\) solve the equation for the variable. $$ \frac{1}{\sqrt[3]{x}}=-3 $$
These are the key concepts you need to understand to accurately answer the question.
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Without solving them, say whether the equations in Exercises \(27-42\) have (i) One positive solution (ii) One negative solution (iii) One solution at \(x=0\) (iv) Two solutions (v) \(\quad\) Three solutions (vi) No solution Give a reason for your answer. $$ x^{1 / 2}=12 $$
A square of side \(x\) has area \(x^{2} .\) By what factor does the area change if the length is (a) Doubled? (b) Tripled? (c) Halved? (d) Multiplied by \(0.1 ?\)
The volume of a cone of base radius \(r\) and height \(h\) is \((1 / 3) \pi r^{2} h,\) and the volume of a sphere of radius \(r\) is \((4 / 3) \pi r^{3}\). Suppose a particular sphere of radius \(r\) has the same volume as a particular cone of base radius \(r\). (a) Write an equation expressing this situation. (b) What is the height of the cone in terms of \(r\) ?
In Exercises \(43-48\), what operation transforms the first equation into the second? Identify any extraneous solutions and any solutions that are lost in the transformation. $$ \begin{array}{r} t+1=1 \\ (t+1)^{2}=1 \end{array} $$
A certificate of deposit is worth \(P(1+r)^{t}\) dollars after \(t\) years, where \(r\) is the annual interest rate expressed as a decimal, and \(P\) is the amount initially deposited. State which investment will be worth more. Investment \(A,\) in which \(P=\$ 10,000, r=2 \%,\) and \(t=10\) years or investment \(B,\) in which \(P=\$ 5000\), \(r=4 \%,\) and \(t=10\) years.
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