Skills Handbook - Exponents - Exercises - Page 794: 3

$5^1*2^4$ or $5*2^4$

There is only one 5 so 5 has and exponent of 1. There are four 2's so the 2 has an exponent of 4 $5^1*2^4$ It can also be written in a way that most people do, with anything that has an exponent of 1 just being invisible $5*2^4$