book Maths Puzzle Numerical Ability

please can you tell me how to turn root -31 into an imaginerary number?

thanks

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book Other Question

Shandra combined the following juices to make fruit punch: 800ml applt juice, 500ml pineapple juice, 1,000ml of orange juice and 200ml of grape juice. What was the total amount of fruit punch made in liters? How do you solve a problem like this
a square root symbol, then a 63x to the 15th power y to the 9th power. all over 7xy to the 2nd power?