exam Maths Puzzle Numerical Ability

If (x-1)^4+(x-5)^4-8=0

what is the value of

x^3+6x+2

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exam Other Question

A researcher polled 260 students at a university and found that 83 of them owned a laptop computer. Estimate the probability that a randomly selected college student owns a laptop computer. 7w+2=3w+94