Chapter 1: Problem 22
Use Table 2 to help write the following numbers. 1.87 megawatts using scientific notation
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Chapter 1: Problem 22
Use Table 2 to help write the following numbers. 1.87 megawatts using scientific notation
These are the key concepts you need to understand to accurately answer the question.
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Astronomers estimate the number of stars in the Milky Way by the number of solar masses that can be approximated. The most common estimate is that there are 100 billion (100,000,000,000) stars in the galaxy. Write this number using E-notation.
The Quadratic Formula gives us the roots of a quadratic equation from its coefficients. We can also obtain the coefficients from the roots. For example, find the roots of the equation \(x^{2}-9 x+20=0\) and show that the product of the roots is the constant term 20 and the sum of the roots is 9 , the negative of the coefficient of \(x\). Show that the same relationship between roots and coefficients holds for the following equations: $$\begin{aligned} &x^{2}-2 x-8=0\\\&x^{2}+4 x+2=0\end{aligned}$$ Use the Quadratic Formula to prove that in general, if the equation \(x^{2}+b x+c=0\) has roots \(r_{1}\) and \(r_{2},\) then \(c=r_{1} r_{2}\) and \(b=-\left(r_{1}+r_{2}\right)\)
It took a crew 2 h 40 min to row 6 km upstream and back again. If the rate of flow of the stream was \(3 \mathrm{km} / \mathrm{h}\), what was the rowing speed of the crew in still water?
A farmer has a rectangular garden plot surrounded by \(200 \mathrm{ft}\) of fence. Find the length and width of the garden if its area is \(2400 \mathrm{ft}^{2}\).
Find all values of \(k\) that ensure that the given equation has exactly one solution. $$k x^{2}+36 x+k=0$$
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