Is the given expression is 'a quintic that is a trinomial'?

$8x^5-4x^4+10$ (Write the answer in Yes or No)

Is the given expression is 'a quadratic that is a monomial'

$4x^2$ (Write the answer as Yes or No)

Is the given expression is 'a polynomial that is a quartic'

$10x^4+3x^3-6x^2+x+8$ (Write the answer as Yes or No)

Writing the expression that meets the following characteristic, we get $4x^2+k$. Write the value of $k$.

'a quadratic with no constant term'

Writing the expression that meets the following characteristic, we get $2x^6+4x^4+k$. Write the value of $k$.

'a trinomial of degree $6$'

Solve this crossword puzzle using the clues below.

From group listed, identify which term is not a like term and justify your choice.

$7x,2x,2x^2,-3x$