I really don't know how to do this-​

What is the value of x? enter your answer in the box. photo attached.

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 florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.