Find the circumference of the circle 30m. use 3.14 for n

Why is causation so much more difficult to prove than correlation?

Koda is making birdhouses for a park. the instructions tell him how many of each wooden shape is needed for one birdhouse. complete each statement to adjust the number of shapes for each new situation if he follows the given instructions. to make 8 birdhouses, koda will trapezoids.  for koda to make birdhouses, he will need 12 rectangles. if koda uses 4 squares to make birdhouses, he will use triangles. 

What is the greatest common factor gcf of 10 and four