-3k is the answer. -3 * k is an answer but it is not simplified. The simplified version is -3k.
1) cos (150°)=- cos(180°-150°) = - cos(30°) and - cos30° = - √(3) / 2
sin(150°) = sin(180°-150°) =sin30. and sin30° = 1/2
Then : 5/2(cos 150° + i sin 150°) becomes : 5/2{(-√(3) /2 + I (1/2)]
OR 5/4( - √3 + i)
The variation equation is qr = 25
<h3>How to determine the equation?</h3>
An inverse variation is represented as:
qr = k
Where k is the constant of variation
When q = 10 and r =2.5, we have:
k = 10 * 2.5
Evaluate
k = 25
Substitute k = 25 in qr = k
qr = 25
Hence, the equation is qr = 25
Read more about variation at:
brainly.com/question/6499629
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