22.50 as a fraction is 45/2. Happy to help. :)
I think it is (xy). Hope that is right.
For any arbitrary 2x2 matrices
![\mathbf C](https://tex.z-dn.net/?f=%5Cmathbf%20C)
and
![\mathbf D](https://tex.z-dn.net/?f=%5Cmathbf%20D)
, only one choice of
![\mathbf D](https://tex.z-dn.net/?f=%5Cmathbf%20D)
exists to satisfy
![\mathbf{CD}=\mathbf{DC}](https://tex.z-dn.net/?f=%5Cmathbf%7BCD%7D%3D%5Cmathbf%7BDC%7D)
, which is the identity matrix.
There is no other matrix that would work unless we place some more restrictions on
![\mathbf C](https://tex.z-dn.net/?f=%5Cmathbf%20C)
. One such restriction would be to ensure that
![\mathbf C](https://tex.z-dn.net/?f=%5Cmathbf%20C)
is not singular, or its determinant is non-zero. Then this matrix has an inverse, and taking
![\mathbf D=\mathbf C^{-1}](https://tex.z-dn.net/?f=%5Cmathbf%20D%3D%5Cmathbf%20C%5E%7B-1%7D)
we'd get equality.
Answer:
x=5
Step-by-step explanation:
I hope this answers helps you!
You first wanna find <BAD, because if AB is perpendicular to AC, then it has to form a 90 degree angle. So 90-56=34 degrees. So now you have a 34 & 63 degrees in the ABD triangle. In a triangle, all angles add up to equal 180 degrees. So 34+63+x=180...and x=83. So <ADB= 83 degrees. Now you want to find angle ADC...which you can just subtract 83 from 180 (because <ADB & <ADC forms 180 degree angle). You will then get 97 as angle ADC. So, the same thing as before, add up 56+97+x=180, because all angles (in the triangle ADC) add up to be 180 degrees. X will then equal 27 degrees. Angle ACB= 27 degrees.