A rectangle has a length of 12 cm and a width of 9 cm. What is its perimeter? 21 cm
42 cm
44 cm
189 cm

Will give brainliest summations with algebraic expressions image shown

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality