In Cheko's school, 2 3 of the students are girls. There are 174 more boys who wear spectacles than those boys who do not wear spectacles. How many boys wear spectacles if there are 3680 girls?

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?

Tell whether the two rates form a proportion

Which of the following vectors are orthogonal to (2,1)? check all that apply