exam Maths Puzzle Numerical Ability

Each question of a 5-question multiple choice exam has 3 possible answers. Suppose a student picks an answer at random for each question. Find the probability the student selects the correct answer on none of the questions.

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I really can not understand this problem could someone please help me.The question is from a worksheet.Rewrite the equation 4x-10y=11 as a function of x.Please help me thank you in advance 6. Machine trades- For the crankshaft, AB=4.2 in., and the connecting rod AC= 12.5 in. Calculate the size of angle A when the angle at C is 12 degrees.