Chapter 7: Problem 38
What is a proportion? Give an example with your description.
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Chapter 7: Problem 38
What is a proportion? Give an example with your description.
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Add or subtract as indicated. Simplify the result, if possible. $$\frac{x+7}{4 x+12}+\frac{x}{9-x^{2}}$$
Explain how to find the least common denominator for denominators of \(x^{2}-100\) and \(x^{2}-20 x+100\)
Add or subtract as indicated. Simplify the result, if possible. $$\frac{7}{5 y^{2}-5 y}-\frac{2}{5 y-5}$$
We have seen that Young's rule $$ C=\frac{D A}{A+12} $$ can be used to approximate the dosage of a drug prescribed for children. In this formula, \(A=\) the child's age, in years, \(D=\)an adult dosage, and \(C=\)the proper child's dosage. Use this formula to solve Exercises \(73-74\) When the adult dosage is 1000 milligrams, a child is given 500 milligrams. What is that child's age?
Perform the indicated operation or operations. Simplify the result, if possible. $$\frac{5}{x^{2}+3 x y+2 y^{2}}-\frac{7}{x^{2}-x y-2 y^{2}}+\frac{4}{x^{2}-4 y^{2}}$$
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