exam Maths Puzzle Numerical Ability

(rad)1/6 im not sure if I can go any farther simplifying this, can i?

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exam Other Question

How can $5400 be invested, part of it at 8% and the remainder at 10%, so that the two investments with produce the same amount of interest?
Thanks Please help me solve the following problem:

Find all the real zeros of {{{3x^4 + 3x^3 -17x^2 + x - 6 =0}}}

Thank You