Is there a way to convert a symbolic result from using rational expressions 
and constants to the corresponding expression using reals?

For example if I have a result of

-15/28*2^(2/3)*a*hh^2+32/pi*b^3

I need to convert it to

-0.85039*a*hh^2 + 10.186*b^3

Anything I try I gives  "cannot evaluate symbolic expression numerically"

I need both types of solutions for grading homework. Many expressions are 
more complicated and I change upstream values frequently so converting each 
term by hand is not practical.

I have been looking for a solution for some time.  Thank you.

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