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dybincka [34]
3 years ago
13

A board is 27 inches long. How long is the board in centimeters? Use the following conversion: 1 inch is 2.54 centimeters.

Mathematics
1 answer:
Elina [12.6K]3 years ago
6 0

1 inch = 2.54 cm

 so multiply 27 by 2.54


27 x 2.54 = 68.58 cm long

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Anestetic [448]

Answer:

(14,\frac{-7}{2})

General Formulas and Concepts:

<u>Pre-Algebra</u>

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Step-by-step explanation:

15. \frac{cotx+1}{cotx-1} = \frac{cotx+cotx.tanx}{cotx-cotx.tanx} = \frac{cotx(1+tanx)}{cotx(1-tanx)} = \frac{1+tanx}{1-tanx}   \\

16.  \frac{1+cos\alpha }{sin\alpha } = \frac{sin\alpha }{1-cos\alpha }

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=> The clause is correct

17. Do the same (16)

18. \frac{sinx}{1-cosx}+\frac{sinx}{1+cosx} = \frac{sinx(1+cosx) + sinx(1-cosx)}{(1+cosx)(1-cosx)} = \frac{sinx + sinx.cosx + sinx - sinx.cosx}{1-cos^{2}x} = \frac{2sinx}{sin^{2}x }= \frac{2}{sinx} = 2cosecx

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Same with (16) => Left = Right => The clause is correct

22. Do the same (21)

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