exam Maths Puzzle Numerical Ability

Can you please help me with these radicals. I have to simplify or reduce.
a) ^3 sq. rt. 24x^5y^3
b) sq.rt. 3 over 8
c) sq. rt. 12 + sq.rt. 108
d) ^3 sq.rt. of 16 * ^3 sq.rt. o

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exam Other Question

Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point.

f(x) = -x squared - 2x - 5
I cannot figure out how to solve this logarithm equation

log(8x)=7.9+log(1.25)

Please help.

xandra