Chapter 1: Problem 26
Plot the points and find the slope of the line passing through the pair of points. $$(12,0),(0,-8)$$
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Chapter 1: Problem 26
Plot the points and find the slope of the line passing through the pair of points. $$(12,0),(0,-8)$$
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For groups of 80 or more people, a charter bus company determines the rate per person according to the formula Rate \(=8-0.05(n-80), \quad n \geq 80\) where the rate is given in dollars and \(n\) is the number of people. (a) Write the revenue \(R\) for the bus company as a function of \(n\) (b) Use the function in part (a) to complete the table. What can you conclude? $$\begin{array}{|l|l|l|l|l|l|l|l|}\hline n & 90 & 100 & 110 & 120 & 130 & 140 & 150 \\\\\hline R(n) & & & & & & & \\\\\hline\end{array}$$
Use a graphing utility to graph the function. Be sure to choose an appropriate viewing window. $$f(x)=4+(1 / x)$$
Data Analysis: Light Intensity A light probe is located \(x\) centimeters from a light source, and the intensity \(y\) (in microwatts per square centimeter) of the light is measured. The results are shown as ordered pairs \((x, y)\) (Spreadsheet at LarsonPrecalculus,com) $$\begin{array}{lll} (30,0.1881) & (34,0.1543) & (38,0.1172) \\ (42,0.0998) & (46,0.0775) & (50,0.0645) \end{array}$$ A model for the data is \(y=262.76 / x^{2.12}\) A. Use a graphing utility to plot the data points and the model in the same viewing window. B. Use the model to approximate the light intensity 25 centimeters from the light source.
(a) use a graphing utility to graph the function and (b) state the domain and range of the function. $$s(x)=2\left(\frac{1}{4} x-\left[\frac{1}{4} x\right]\right)$$
Use Hooke's Law for springs, which states that the distance a spring is stretched (or compressed) varies directly as the force on the spring. An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only one-half the distance the door travels. The door moves a total of 8 feet, and the springs are at their natural lengths when the door is open. Find the combined lifting force applied to the door by the springs when the door is closed.
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