exam Maths Puzzle Numerical Ability

Please help with these problems. I am very confused.
1.) Multiply. Simplify your answer. Type an exact answer, using radicals as needed.√3(6√7 - 2√25)= ...
2.

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exam Other Question
You are given a multiple choice test consisting of 10 questions. Each question has 3 choices. If you guess at all of the answers, what is the probability that you will choose the First determine the deflection based solely on the distributed load.
delta = 5wL^4/384 EI
= (5)(2kip/ft)(24^4ft)(12in/ft)^3/(384)(29,000ksi)(1330in^4)
= .387