I. Five cubed
II. Two root two
III. Four times (slight pause!) seven plus eight x
IV. F triple prime of x equals fourteen times x to the power five
V. Twelve sub nine x
VI. Four to the power two cubed
VII. Zero!
VIII. Four divided by five (I don't understand your objection to this! It is certainly mathematical. For addition I wouldn't say four added five, but I would say four plus five.)
IX. The set of values of 19 times x to the power five pi such that x is greater than or equal to 5
X. The cube root of seven times root four
XI. Four times e to the power phi
XII. Fourteen minus seven minus fourteen squared
XIII. Sine theta equals five times cot theta squared
XIV. The set of integers eight, two and four
There is some ambiguity in a few of the above of course, but that's why we use mathematical symbols, to avoid the ambiguity! It would be possible to express these in words without ambiguity, but the penalty is that many more words would be needed!