The algebraic expression for, $x$ cubed less than $y$ cubed is $y^3-x^k$. Find $k$.

Write the following using literals, numbers and signs of basic operations:

The quotient of $x$ by$8$ is multiplied by $y$

Ranjit scores $80$ marks in English and $x$ marks in Hindi. What is his total score in the two subjects? $\left(80+x / x-80 / 80-x\right)$

If $b \times b \times b \times ... 15$times is $b^a$. Find the value of $a$

Writing ($y \times y \times y \times ... 20$ times) in the exponential form, we get, $y^k$. Find $k$.

If the exponential form of $14 \times a \times a \times a \times a \times b \times b \times b$ is $14a^x{b}^y$, then $x+y$ is

Writing $6\times x\times x\times y\times y$ in the exponential form, we get, $6x^2{y}^k$. Find $k$.

Writing $3 \times z \times z \times z \times y \times y \times x$ in exponential form, we get, $3x{y}^2{z}^k$. Find $k$.

If the product form of  $x^2{y}^4$ is $x\mathit{\times }k\mathit{\times }y\mathit{\times }y\mathit{\times }y\mathit{\times }y$, then $k$ is