Which algebraic expression is a polynomial?

answers-

4x^2 – 3x + 2 over x

–6x^3 + x^2 – the square root of 5

8x^2 + the square root of x

–2x^4 + 3 over 2x

The answer to this question is
-6x^3+x^2- the square root of 5

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.