Take a walk. the centers for disease control monitors the physical activity level of americans. a recent survey on a random sample of 23,129 americans yielded a 95% confidence interval of 61.1% to 62.9% for the proportion of americans who walk for at least 10 minutes per day.

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This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

Which expression is equal to (f+g)(x)?