Which algebraic expressions are polynomials? Check all that apply. 21 - 7 /
By - 3x2 + x
y2 + 5y - v3
2- 4x
-X6
0-17) - 1.22+
글 + 4

Ithink you’re answering is d

1. statement- ca is parallel to db and e is the midpoint of ad reason- given2. statement- reason- alternate interior angles3. statement- de is congruent to ae reason- definition of midpoint4. statement- triangle aec is congruent to triangle deb reason- asa (angle side angle)

The correct answer is c.