If you see her p. s. Tell me the and give you brainlist

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.

What is the radius of the cone in the diagram? round your answer to the nearest whole number