Enrollment at roosevelt middle school is being reviewed by the school staff. the table gives the numbers of boys and girls in grades 6 to 9.

grade girls boys
6 9 12
7 12 18
8 15 20
9 25 36

in which two grades is the relationship between the numbers of girls and boys proportional?

You put $2000 in an account with a simple interest rate of 1.5%. how long does it take for the account to earn $60?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

What is the result of adding the system of equations? 2x+y=4 3x-y=6