Plese / i'll give points, medal, thnaks the lengths of two sides of a triangle are shown below: side 1: 3x2 − 2x − 1 side 2: 9x + 2x2 − 3 the perimeter of the triangle is 5x3 + 4x2 − x − 3. part a: what is the total length of the two sides, 1 and 2, of the triangle? (4 points) part b: what is the length of the third side of the triangle? part c: do the answers for part a and part b show that the polynomials are closed under addition and subtraction? justify your answer

The correct answer for part A is 5x² +7x -4. 5x³ -x² -8x -7 is the right answer for part B. Polynomials are always closed if under addition or subtraction. The answers of both parts A and B are polynomials.

Hope this helps!

~LENA~

from the sentence, "tomorrow morning, akiko will arrive an hour late" depicts a third person perspective because it doesn't use any pronoun to replace akiko, the subject of the sentence, and it is in singular form since akiko is only one person.

the answer would be c