Gina is asked to identify a rational expression. Which of the following could she choose?(1 point)

Question

Responses

5.32x−1
Start Fraction 5.3 over 2 x minus 1 End Fraction

8x2+70
Start Fraction 8 x squared plus 7 over 0 End Fraction

9x−48+x√
Start Fraction 9 x minus 4 over 8 plus Start Root x End Root End Fraction

x32+52x9

Answer 1

A rational expression is a ratio of two polynomials. Therefore, Gina could choose:

5.32x−1
Start Fraction 5.3 over 2 x minus 1 End Fraction

and

x^3/2+5/2x^9

These can be written as ratios of two polynomials. Any expression with square roots or denominators of zero would not be considered a rational expression.