Find the missing side as a simplified polynomial given that the perimeter of the rectangle is 8x^2+2x+8 The given side is 3x^2-2x+5

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

Strawberries cause two hours per pound kate buys 5 pounds he gets 20% off discount on the total cost how much does kate pay for the strawberries