98 - 9y + 10 (3+y) = 213 what does the varibale y equal. show your work : )

What does x = in this equation x+3+2x=x+5

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

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.