(1 point) math 215 homework homework1, problem 1 what is the distance from the point (12, 15, 15) to the x-y plane? what is the equation of the sphere centered at (12,15,15) that touches the x-y plane? = 0. (note: your equation must be written as an expression set equal to zero, by moving all terms to the left hand side of the equation. do not normalize the radius term to 1.)

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.