exam Maths Puzzle Numerical Ability

Perform the indicated operations:
3sqrt[3] + 2sqrt[27] �sqrt[12]

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exam Other Question

I am just not getting this section....

Use the formula for S[n] to find the sum for the geometric sequence: 4,-16,64,-256,1024.

Thanks in advance.

Annie C. thirty percent of the sulfur desiccated. If 42 tons did not desiccate, how much sulfur was there in all?