Three tennis balls are packaged in a box as shown below. the box is 12.1 centimeters long, 3.5 centimeters wide, and 3.5 centimeters tall. each ball is 3.3 centimeters in diameter. what is the volume of the empty space in the box?

The ratio of blue cards to green cards is 2 to 5. there are 8 blue cards. complete the diagram and explain how you can find the number of green cards.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²