The number of dead zones in the ocean was around 50 in 1950. That number increased by a multiple of 10 by 2000. This rate is projected to continue if nothing is done. By 2100, how many dead zones would you expect there to be?

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.