3 years ago

Alice purchased paint in a bucket with a radius of 9 in. and a height of 9.5 in. The paint cost $0.09 per in3.

1 answer:

5 0

$\pi$ r^2 = cross-sectional area of paintbucket.
3.14 (Your approximate value of pi) * 9^2 = 254.34
254.34 * 9.5 = total volume of bucket.
2,416.23 in^3.

0.09$ * 2416.23 = cost
The cost would be $217.46 (To the nearest cent)

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Sina=3/5 find cos2a

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$\huge \purple{\therefore \cos2a} \orange{= }\red{\frac{7}{25} }$

Step-by-step explanation:

$\because \cos2a =1 - 2 { \sin}^{2} a \\ \\ \therefore \cos2a =1 - 2 \bigg( { \frac{3}{5} }\bigg) ^{2} \\ \\\therefore \cos2a =1 - 2 \times \frac{9}{25} \\ \\\therefore \cos2a =1 - \frac{18}{25} \\ \\\therefore \cos2a = \frac{25 - 18}{25} \\ \\ \huge \purple{\therefore \cos2a} \orange{= }\red{\frac{7}{25} } \\ \\$