Answer:
- b/10
- 8
- 9
- 41cm
Step-by-step explanation:
[tex]\frac{b}{2} -\frac{2b}{5} \\Find -The -LCM -of-the-denominators\\\\LCM = 10\\\frac{\frac{b}{2}-\frac{2b}{5} }{10} \\\frac{5b-4b}{10} \\Answer = \frac{b}{10}\\\\(2). (512)^{\frac{1}{3} } \\Using- Indices -rule;\\(512)^{\frac{1}{3} } = \sqrt[3]{512^{1} } \\= 8^1\\=8\\[/tex]
[tex](3). [27^{\frac{1}{3} } ]^2\\\\(\sqrt[3]{27^{1} } )^2\\= (3^1)^2\\=3^2\\=9\\(4) . C = 82\pi\\r =?\\C = 2\pi\times r\\82\pi=2\pi r\\\frac{82\pi}{2\pi } =\frac{2\pi r}{2\pi} \\r = 41cm[/tex]
