Answer: 0.1x - 16 (c)
Explanation: The perimeter is the sum of all three sides of the triangle. Since the three side are 0.5x + 9, 3x, and (-3.4x) - 25, the sum is as follows:
0.5x + 9 + 3x + (-3.4x) - 25 = 0.1x - 16
Answer is y = 3sin2(x - pi/4).
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For B the answer is 1 : 30. For A the graph is Y goes up 2 for every 60 on the X.
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