book Maths Puzzle Numerical Ability

My question says to simplify the radicals.

(square root of 6+3 square root of 3)(6+3 square root of 3)

Could you help me with this? thanks!

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book Other Question

Write these four values form lowest to highest. -3, 3 1/2, 3.2, -5 Each number below is the number of miles the Hoover family has driven in a week. Determine the frequency of the class interval for this data.

142 284 557 354 315
265 329 157 3