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The first answer is 1; the second answer is 2.

Step-by-step explanation: The reason for this is that the first one is three tails.  On this biased coin, since the head chance is two out of five, the tails chance must then be three out of five.  The permutation that we are looking for is specifically all three tails for the first problem.  To achieve this, we multiply each scenario by the next - the first scenario is 3/5, the second is 3/5 again, and the third is 3/5 yet again.  When multiplied together, it becomes 27/125.  For the second, it is a similar idea - we seek two tails and one head.  The first is 3/5, the second is 3/5, but the third is 2/5 because of the 2/5 chance of a heads roll.  Thus, this multiplies out to 18/125.

y/x=18

step-by-step explanation:

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation: