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Chapter 7: Problem 10
Line 1 is defined by \(y=3 x+7\), and line 2 is perpendicular to line 1. What is the slope of line 2 ? \(\bigcirc-3\) O \(\frac{1}{3}\) \(\bigcirc-\frac{1}{3}\) O I don't know.
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If \(m\) and \(n\) are each a number between \(-1\) and 0 , exclusive, what can you say about \(m n\) ?
In 40 seconds, a mountain biker travels 230 feet. What is her speed in miles per hour? (Note: 1 mile \(=5280\) feet) $$ \begin{array}{r} \frac{230 \times 60 \times 60}{40 \times 5280} \\ \frac{230 \times 5280}{40 \times 60 \times 60} \\ \frac{40 \times 60 \times 60}{230 \times 5280} \\ \text { I don't know. } \end{array} $$
Which of the following is equivalent to \(x^{-2}\) ? $$ \begin{array}{r} -x^2 \\ \frac{1}{x^2} \\ \sqrt{x} \end{array} $$ I don't know.
Line 1 is defined by \(y=3 x+7\), and line 2 is parallel to line 1 . What is the slope of line 2 ? O \(-3\) 03 O \(\frac{1}{3}\) I don't know.
If \(x^2=25\), which of the following is true? $$ \begin{aligned} & \bigcirc x=5 \\ & \bigotimes x=-5 \\ & \hdashline x=\pm 5 \\ & \text { idon't know. } \end{aligned} $$
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