earth's radius is approximately 4000 mi. about two thirds of the Earth's surface is covered by water. estimate the land area on earth

9/10 divide by -3/15 as a mixed number

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.

Pls the last one and it has to be like number 6