True or false?

Circumference/diameter = π for every circle.

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

We just started the introduction into circles and i have no idea how to do this.

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the sunflower? ? plz write a proportion to solve i will give you 100 points