Answer:
9
Step-by-step explanation:
3½ + 5½ can also be phrased as 3.5 + 5.5
3.5 + 5.5 = 9
Answer:
cos 2 x=1-sin^2 x
Step-by-step explanation:
x=-135°
cos 2x=cos (-270)=cos (-270+360)=cos 90=0
or cos 2x=1-2sin ²x=1-2(sin (-135))²
=1-2(-sin 135)²
=1-2(sin 135)²
=1-2(sin (180-45))²
=1-2(sin²45)
=1-2 (\frac{1}{\sqrt{2}})²
=1-1
=0
X=-1/2 that is the answer
Answer:

Step-by-step explanation:
Please see attached picture for full solution.
Making x the subject of formula means that x is on the left hand side and all the other terms are on the right hand side of the equal sign.
In case your question is y= [(2x-5)/3x] -7, I have also attached the working in the second picture.