Triangle A is rotated 90-degrees clockwise about the origin. Which triangle is the image of this rotation? * B
C
D
none of these

The answer is B

Step-by-step explanation:

The equation for a 90 degree clockwise rotation is (x,y) -> (y,-x)

so (-2, 2) -> (2,2). You can also look up "rotation calculator", it really helped me get through this unit haha

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b