If we subtract a monomial from a binomial, then the answer is at least a binomial.
Answer
If we subtract a monomial from a binomial, then the answer is at least a binomial. (False) Correct : It can be monomial also, for example 2x – (7 + 2x) = 2x – 2 – 2x = -7 which is a monomial.
If we add a monomial and a binomial, then answer can never be a monomial.
Answer
If we add a monomial and a binomial, then answer can never be a monomial. (False) Correct : It can be monomial. For example : 3x + (5 – 3x) = 3x + 5 – 3x = 5 which is monomial.
If $x=3$ and $y=\frac{1}{3}$ then the value of $x y\left(x^2+y^2\right)$ is $9 \frac{1}{9}$.
Answer
If $x=3$ and $y=\frac{1}{3}$ then the value of $x y\left(x^2+y^2\right)$ is $9 \frac{1}{9}$. (True) $\begin{array}{c} x y\left(x^2+y^2\right)=3 \times \frac{1}{3}\left[(3)^2+\left(\frac{1}{3}\right)^2\right] \\ =1\left(9+\frac{1}{9}\right)=9 \frac{1}{9} \end{array}$