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Question Number 21636 by mondodotto@gmail.com last updated on 29/Sep/17

Commented by mondodotto@gmail.com last updated on 30/Sep/17

$$\mathrm{please}\mathrm{help}!$$

Answered by Tinkutara last updated on 30/Sep/17

$$3.2+3.2\times \frac{3}{4}+3.2\times {\left(\frac{3}{4}\right)}^2+...+3.2{\left(\frac{3}{4}\right)}^4$$$$=\frac{3.2(1-{\left(\frac{3}{4}\right)}^5)}{1-\frac{3}{4}}=\frac{781}{240}\approx 3.254\mathrm{m}$$

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