Answer:
-2a^5 + 4a^4 + 5a^3 + 2/3 a
Explanation:
Standard form for an expression is written in descending order according to the exponent on the variable. The term with the highest exponent is written first.
2/3 a + 5a^3 + 4a^4 - 2a^5 becomes -2a^5 + 4a^4 + 5a^3 + 2/3 a