The ratio of girls to boys in a classroom is 3:5. Kevin says there must be 8 students in the classroom. Which explains whether Kevin is correct? Kevin is correct because 3 girls + 5 boys = 8 students.
Kevin is correct because 5 girls + 3 boys = 8 students.
Kevin is incorrect because 3:5 may be a simplified ratio.
Kevin is incorrect because the ratio 3:5 does not compare different units.

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The blue whale is the largest animal living on the earth. the average blue whale measures 100 feet long (30 meters) and weighs 300,000 pounds (136,000 kilograms). a whale’s head is 1⁄3 of the length of its body. a new baby whale is 1⁄4 the length of a grown whale. the average man is 1⁄17 the length of a blue whale, and 1⁄1,818 its weight. a human baby measures 1⁄4 of the length of an adult. calculate the following information: how long is a whale’s head? how long is a new baby whale? how tall is the average man? how much does the average man weigh? how tall is the average human baby?

At which value in the domain does f(x) =0?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.