An unknown number x is at most 20. which graph best represents all the values of x?

number line graph with closed circle on 20 and shading to the right.
number line graph with open circle on 20 and shading to the right
number line graph with closed circle on 20 and shading to the left.
number line graph with open circle on 20 and shading to the left

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?

What is 1/2 x (6 x 4)+3 + 2 show your work

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.