a driver is 15 feet below the surface of the water 10 seconds after he entered the water 90 feet below the surface after 40 seconds. what is the rate of change

Which matrix multiplication is possible?

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.