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If you mean: cd which means c*d then it is 3.5*12.8 = 44.8
Replace each variable in the expression by its value and then find the value of the expression.
Technically is can be anything you want it to be since you did not equate this expression to any value.
Take the value of each variable in the expression and replace the variable by its value. Then do the math!
The answer will depend on the expression - which is not given!