Answer:
43.96
Step-by-step explanation:
ok so you use the formula: A= 3.14•r•2 next you plug in your values a=3.14•7•2 3.14•7= 28.98•2=43.96
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:
Step-by-step explanation:
we divide every term by 2 and we get:
10x/2 + 6y/2 +5/2= 5x +3y+5/2
Answer:
Step-by-step explanation:
7) The tangent angles are 90° each.
The angles of a quadrilateral add up to 360°, so ? = 360°-90°-90°-73° = 107°.
8) Solve this the same way as question 7). ? = 360°-90°-90°-57° = 123°.
Questions 9) and 10) are cut off, so I assume you don't need to know those.