Question

Can someone please help me !

Answer 1

$2)~3x\to\text{Linear Monomial, because it's of 1st degree.}\to B\\\\ 3)~2x^4-x+5\to\text{Quartic Trinomial, because it's of 4th degree.}\to C\\\\ 4)~(2x^2-5x+6)+(5x^2-3x+4)=(2x^2+5x^2)-(5x+3x)+(6+4)\\\\ =7x^2-8x+10\to A$