What is the volume of the sphere with a 12 cm radius

How do you answer this question? (step by step)

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c