exam Maths Puzzle Numerical Ability

please help me solve and simplify sqrt(1/2) * ( sqrt(8) + sqrt(2))

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exam Other Question

Divide:

(2x3power - 19x2nd power + x - 15) divided by (x +4)
Baseball story problem

one seventh of his hits were doubles
12.5 percent of his hits were home runs
82 hits were singles
there were 0 triples

How many total hits did the p