Why does no one answer my questions?

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

Write the expression as a single natural logarithm. 2 in a - 4 in y

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.