Under the ACT Math Materials Section, I have some questions that my answers are different than yours and I believe mine are correct.. Please tell me what are the correct answers 

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1. For Practice Problem # 2 for Probability, probability is always given as a fraction, not a percent. 50% is equal to 1/2, which is the correct answer2. Definitely a typo in Problem #3 for Absolute Value -- the answer is 43. The correct answer is (-3x-81)4. This is a poorly worded question. As explained by the answer in the answer key, x = 4 like you found, but the question asks for the "dimension" -- which is defined here as area (16)