Compute the product a for the following pairs of matrices.
a. a = −1
1 0
b= −1
1 0

b. a = 0
0 −1
b= −1 0
0 1

c. a =

2 −
2

2

2
b= 0
0 4

d. a = 1
0 1
b= 0
0 2

e. a =
12

2
−
2
12
b=

2 −12
12

2

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?