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Answer:
Felix books are less expensive.
Tyler's books vary in price more.
Step-by-step explanation:
Screw that!
Note: My answer came from Yahoo answer also there are some good reviews from that answer.
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The HumanSpider
The prallelogram whose adjacent sides are equal and one vertex angle is 90 degrees is a square.
The value of angle 1 is 90 degrees as the diagonal of the square intersect at 90 degrees.

The value of y is 23.
The diagonal of the square bisect the vertex angle hence the angle of 3x is 45 degrees.

Thus, the value of x is 15 degrees.
The value of 12z is 45 degrees.

Thus, the required value of z is 3.75 degrees.