How would you read the expression, 45?

four-fifths

four to the fifth power

five-fourths

four to the five power

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None of the above unless you miss typed it that is 45. If it was 4^5 it would be four to the fifth power, if it was 4/5 it would be four fifths, if it was 5/4 it would be five fourth, and four to the five power is the same as four to the fifth power.

Four-fifths

Step-by-step explanation:

If it is 4/5, then it will be read as:

Four-fifths