70% of US teenagers consume at least one energy drink per week. Some US teenagers were randomly selected for a survey and asked if they consume at least
one energy drink per week. What is the probability that the first teenager to respond
"yes" is within the first 3 to respond?
PLS HELP TYSM

Is a positive integer raised to a negative power always positive

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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.