book Maths Puzzle Numerical Ability

3(x+y)^2+4(x+y)-6, when x= 4, and y = -1

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Slove the Problem:
the matching section of an exam has 5 questions and 8 possible answers in how many different ways can a student answer the 5 question, if none of the answer choices can be repeated?
Nozomi drinks 2 cups of coffee each morning. Each cup contains 140 milligrams of caffiene. The human body can metabolize about 12% of any caffiene remaining in the blood stream ea