There are 220 students in year 9.

1 answer:

8 0

20% of 220 is 44 people so if you divide 220 by 2 you have 110 of each then add 44 to one and subtract 44 from the other the answer to a is 154 and the answer to b is 66

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What is the value of w?<br><br> A. 7<br> B. 3.5<br> C. 7square root of three<br> D. 14

Anarel [89]

Answer:

$\sf{\cos(30) = \frac{7 \sqrt{3} }{w} } \\ \sf{ \frac{ \sqrt{3} }{2} = \frac{7 \sqrt{3} }{w} } \\ \sf{w = \frac{7 \sqrt{3} \times 2 }{ \sqrt{3} } = 14}$