What is the product of 3.5×10^3 and 2.4 × 10^3

The equation respenting the left table is

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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.