Well... you don't necessarily need to get the cosine value, in order to get the double angle
Y and x have a relationship that is directly proportional;
y = 7 when x = 2
when y = 21 and x = ?
y : x
7 : 2
if we multiply 7 wit 3, the answer is 21
3 x 7 : 2 x 3
21 : 6
So, when y = 21, x = 6
10 pens=£6.50
1 pen=£0.65
4 pens=£0.65×4
4 pens=£2.6
The answer would be 30 degrees because points F, G, H, and J are collinear, all you would have to do is figure out /_GHK by subtracting 180 degrees from it.
Like this :
JHK = 180 degrees - 120 degrees = 60 degrees
1.07 as a percent is 107% 1.07 as a fraction is 1 1/14
Hope this helps!
