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Mathematics 4 Online
OpenStudy (anonymous):

Find the value of y. Round your answer to the nearest tenth. cos 21 degrees= 9/y A. 23.4 B. 8.4 C. 25.1 D. 9.6

OpenStudy (johnweldon1993):

Multiply both sides by 'y' and then divide both sides by cos21 so \[y = \frac{ 9 }{ \cos21 }\]

OpenStudy (anonymous):

so D?

OpenStudy (johnweldon1993):

That would be correct!

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