Which operation is not closed for polynomials? a) (x2 − 3x + 5) + (5x2 − 8x + 4) b) (4x3 − 2x + 6) − (x2 + 3x + 2) c) (x2 − 3x + 5)(x3 − 4x + 4) d) (x2 + 3x + 5) (x3 + 4x + 2)

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

52 cm radius = diameter = area = circumference = circumfer

Sioux co. replaced the roof on its existing building, therefore increasing the building's life by 10 years. the cost of the roof is considered a(n):