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Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

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.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.