In order to solve the following system of equations by addition, which of the following could you do before adding the equations so that one variable will
be eliminated when you add them?
21 – 4y= 5
61 – 31= 10
O A. Multiply the top equation by 3 and the bottom equation by 4.
O B. Multiply the top equation by -3.
C. Multiply the top equation by -2.
D. Multiply the top equation by -3 and the bottom equation by 2.

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’s 8y+48 and factor each expression completely

Which expressions are equivalent to -7+3(-4e-3)? choose all answers that apply: choose all answers that apply: a -4(3e+4)? 4(3e+4) b 12e12e c none of the above