The circumference of a circle is 36.31 meters. what is the approximate length of the radius?

Which of the following expressions is equal to 2x^2+8

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.