book Maths Puzzle Numerical Ability

hi, i am having a lot of difficulty with rationals and here is one question i cannot get.

³√-8mı²

thanks!!

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What is the smallest positive integer that cannot occur as the difference between two positive prime numbers. Jones International Corporation's marginal tax rate is 40%. It can issue 3-year bonds with a coupon rate of 8.5% and par value of $1,000. The bonds can be sold now at a price of