I keep change change with...

$$\left(-9-16\right)+20\div\left(-4\right)$$  

$$\left(-6\right)^2\ -\ \left(-10\right)$$  

$$13\ -\ \left(-1\right)^2$$  

$$\left(-15\ +\ 12\right)\left(-3\right)$$  

The temperature at noon was -6 degrees Fahrenheit. For the next three hours is dropped at a rate of 1 degree an hour. What was the temperature at 3PM?

A submarine descends at a rate of 20 feet per minute. How long will it take to descend to a depth of -100 feet?

A team lost 18 yards, gained 10 yards, lost 9 yards and then gained 16 yards. What is the total yardage gained or lost? What your answer as an integer.

Mrs. Weis found over the past seven days that the temperature dropped by a total of 21 degrees. Find the average number of degrees the temperature changed each day. Represent this average as an integer.

The average temperature in January in Hawaii is 79 degrees. The average temperature in Canada during the same month is -18 degrees. What is the difference in temperature?

A negative TIMES a negative is ALWAYS...

A negative PLUS a negative is ALWAYS...

A positive PLUS a positive is ALWAYS...

A negative DIVIDED by a negative is ALWAYS...

A positive TIMES a negative is ALWAYS...

A negative DIVIDED by a positive is ALWAYS...